Python3 master (#4076)

* delete thridpart/social_django * delete social_django in seahub/urls.py * delete social_django in seahub/settings.py * delete seahub/notifications/management/commands/send_wxwork_notices.py * delete social_django in code annotation * delete seahub/social_core * delete tests/seahub/social_core * delete social_core in seahub/urls.py * delete social_core in seahub/settings.py * change app_label to auth in SocialAuthUser model * 2to3 asserts * 2to3 basestring * 2to3 dict * 2to3 except * 2to3 filter * 2to3 future * 2to3 has_key * 2to3 idioms * 2to3 import * 2to3 imports * 2to3 long * 2to3 map * 2to3 next * 2to3 numliterals * 2to3 print * 2to3 raise * 2to3 raw_input * 2to3 reduce * 2to3 reload * 2to3 set_literal * 2to3 unicode * 2to3 urllib * 2to3 ws_comma * 2to3 xrange * 2to3 zip * add pymysql in __init__.py * fix encode and decode in seahub/cconvert.py * fix seafserv_rpc.is_passwd_set in seahub/views/__init__.py * fix smart_unicode to smart_text * fix force_unicode to force_text * delete seaserv.get_session_info * delete seaserv.ccnet_rpc * fix indent error in seahub/auth/middleware.py * update dev-requirements * update test-requirements * update requirements * fix StringIO to BytesIO in thumbnail * fix seaserv.list_inner_pub_repos to seafile_api.get_inner_pub_repo_list * fix seaserv.list_org_inner_pub_repos to seafile_api.list_org_inner_pub_repos * add logger in seahub/utils/__init__.py * fix sort cmp in seahub/views/__init__.py * fix sort cmp in seahub/base/management/commands/export_file_access_log.py * fix sort cmp in seahub/api2/endpoints/repo_trash.py * fix sort cmp in seahub/api2/endpoints/shared_repos.py * fix sort cmp in seahub/api2/endpoints/shared_folders.py * fix sort cmp in seahub/wiki/views.py * fix sort cmp in seahub/api2/endpoints/wiki_pages.py * fix sort cmp in seahub/api2/endpoints/group_libraries.py * fix sort cmp in seahub/base/models.py * fix sort cmp in seahub/api2/endpoints/upload_links.py * fix sort cmp in seahub/views/ajax.py * fix sort cmp in seahub/api2/views.py * fix sort cmp in seahub/views/wiki.py * fix sort cmp in seahub/api2/endpoints/repos.py * fix sort cmp in seahub/api2/endpoints/starred_items.py * fix sort cmp in seahub/views/file.py * fix sort cmp in seahub/api2/endpoints/dir.py * fix sort cmp in seahub/api2/endpoints/share_links.py * fix cmp to cmp_to_key in seahub/api2/endpoints/admin/device_trusted_ip.py * fix cmp to cmp_to_key in tests/api/endpoints/admin/test_device_trusted_ip.py * delete encode('utf-8') in seafile_api.list_dir_by_commit_and_path * delete encode('utf-8') in is_file_starred * delete encode('utf-8') in seafile_api.list_dir_by_path * delete path.encode('utf-8') in seahub/views/file.py * fix os.write to add encode('utf-8') * add encode('utf-8') for hashlib * add encode('utf-8') for hmac * fix with open(file, 'wb') for binary file * fix encode and decode in seahub/utils/hasher.py * fix next in thirdpart/shibboleth/views.py * fix next in seahub/profile/views.py * fix next in seahub/notifications/views.py * fix next in seahub/institutions/views.py * fix next in seahub/options/views.py * fix next in seahub/share/views.py * fix next in seahub/avatar/views.py * fix next in seahub/views/__init__.py * fix next in seahub/group/views.py * fix next in seahub/views/wiki.py * fix next in seahub/views/sysadmin.py * fix next in seahub/views/file.py * fix string.lowercase to string.ascii_lowercase in test * fix open file add 'rb' in test * fix self.user.username in test * add migrations in file_participants * fix list_org_inner_pub_repos to list_org_inner_pub_repos_by_owner * fix from seaserv import is_passwd_set to seafile_api.is_password_set * fix assert bytes resp.content in test * fix seafile_api.get_inner_pub_repo_list to seafile_api.list_inner_pub_repos_by_owner * fix seafile_api.is_passwd_set to seafile_api.is_password_set * fix AccountsApiTest assert length * rewrite sort_devices cmp to operator.lt * fix bytes + str in seahub/api2/views.py * fix assert bytes resp.content in test * fix hashlib encode in seahub/thirdpart/registration/models.py * change app_label to base in SocialAuthUser * fix base64 encode in seahub/base/database_storage/database_storage.py * fix assert bytes resp.content * remove path.decode in def mkstemp() * remove path.decode in FpathToLinkTest * remove str decode in FileTagTest * remove mock_write_xls.assert_called_once() in SysUserAdminExportExcelTest * fix urllib assert in FilesApiTest * fix link fields in FileCommentsTest * fix get_related_users_by_repo() * fix assert list in GetRepoSharedUsersTest * fix create user in AccountTest * fix repeated key in dict seahub/api2/views.py * add drone.yml * update nginx conf in test * update test conf in test * update dist and push after test success * update drone conf to dist and push * fix assert in BeSharedReposTest * fix seafile_api.list_org_inner_pub_repos_by_owner(org_id, username) to seafile_api.list_org_inner_pub_repos(org_id) * fix seafile_api.list_inner_pub_repos_by_owner(username) to seafile_api.get_inner_pub_repo_list() * update pyjwt requirement * update dist branch in drone * add SKIP in dist and push * fix StringIO to BytesIO in seahub/avatar/models.py * fix if org_id > 0 to if org_id and org_id > 0 * remove payment * fix StringIO to BytesIO in seahub/base/database_storage/database_storage.py * fix send_message to seafile_api.publish_event in seahub/drafts/utils.py * fix send_message to seafile_api.publish_event in seahub/api2/views.py * fix send_message to seafile_api.publish_event in seahub/api2/endpoints/repos.py * fix send_message to seafile_api.publish_event in seahub/views/file.py * fix send_message to seafile_api.publish_event in seahub/utils/__init__.py * fix image_file.read encode in seahub/base/database_storage/database_storage.py * fix DatabaseStorageTest * remove .travis.yml * drone branch include master
2025-04-26 18:40:53 +00:00 · 2019-09-11 11:46:43 +08:00 · 2019-09-11 11:46:43 +08:00 · 99a9ece04e
commit 99a9ece04e
parent 835015c3a8
364 changed files with 1983 additions and 4138 deletions
--- a/.drone.yml
+++ b/.drone.yml
@ -0,0 +1,21 @@
+pipeline:
+  build:
+    image: docker.seafile.top/drone/seafile-pro-builder:v4
+    pull: true
+    secrets: [ github_token, npm_token, travis ]
+    when:
+      branch:
+        event: [ push, pull_request ]
+        include: [ master, python3-master ]
+        exclude: []
+
+    commands:
+      - cd /tmp/seafile-test-deploy && git fetch origin python3:python3 && git checkout python3
+      - ./bootstrap.sh && cd -
+      - export CCNET_CONF_DIR=/tmp/ccnet SEAFILE_CONF_DIR=/tmp/seafile-data
+      - echo "//registry.npmjs.org/:_authToken=$NPM_TOKEN" > ~/.npmrc
+      - cd /drone/src/github.com/haiwen/seahub
+      - ./tests/install-deps.sh
+      - pip install -r test-requirements.txt
+      - .travis/test_seahub_changes.sh; rc=$?; if test "$rc" -eq 0; then ./tests/seahubtests.sh init && ./tests/seahubtests.sh runserver && ./tests/seahubtests.sh test; else true; fi
+      - if test $DRONE_COMMIT_BRANCH = "master"; then .travis/dist_and_push.sh; else true; fi
--- a/.travis.yml.bak
+++ b/.travis.yml.bak
--- a/.travis/dist_and_push.sh
+++ b/.travis/dist_and_push.sh
@ -1,5 +1,5 @@
 #!/bin/bash
-: ${PYTHON=python}
+: ${PYTHON=python3}

 set -e
 if [[ ${TRAVIS} != "" ]]; then
@ -7,23 +7,25 @@ if [[ ${TRAVIS} != "" ]]; then
 fi

 set -x
-SEAHUB_TESTSDIR=$(python -c "import os; print os.path.dirname(os.path.realpath('$0'))")
+SEAHUB_TESTSDIR=$(python -c "import os; print(os.path.dirname(os.path.realpath('$0')))")
 SEAHUB_SRCDIR=$(dirname "${SEAHUB_TESTSDIR}")

-export PYTHONPATH="/usr/local/lib/python2.7/site-packages:/usr/lib/python2.7/site-packages:${SEAHUB_SRCDIR}/thirdpart:${PYTHONPATH}"
+export PYTHONPATH="/usr/local/lib/python3.7/site-packages:/usr/local/lib/python3.7/dist-packages:/usr/lib/python3.7/site-packages:/usr/lib/python3.7/dist-packages:${SEAHUB_SRCDIR}/thirdpart:${PYTHONPATH}"
 cd "$SEAHUB_SRCDIR"
 set +x

 function commit_dist_files() {
-  git checkout -b dist-$TRAVIS_BRANCH
+  git checkout -b dist-$DRONE_COMMIT_BRANCH
  git add -u . && git add -A media/assets && git add -A static/scripts && git add -A frontend && git add -A locale
-  git commit -m "[dist] Travis build: #$TRAVIS_BUILD_NUMBER, based on commit $TRAVIS_COMMIT." -m "$TRAVIS_COMMIT_MESSAGE"
+  git config --global user.email "drone@seafile.com"
+  git config --global user.name "Drone CI"
+  git commit -m "[dist][CI SKIP] Drone CI build: #$DRONE_BUILD_NUMBER, based on commit $DRONE_COMMIT." -m "$DRONE_COMMIT_MESSAGE"
 }

 function upload_files() {
    echo 'push dist to seahub'
-    git remote add token-origin https://imwhatiam:${GITHUB_PERSONAL_ACCESS_TOKEN}@github.com/haiwen/seahub.git
-    git push -f token-origin dist-$TRAVIS_BRANCH
+    git remote add token-origin https://$GITHUB_TOKEN@github.com/haiwen/seahub.git
+    git push -f token-origin dist-$DRONE_COMMIT_BRANCH
 }

 function make_dist() {
--- a/dev-requirements.txt
+++ b/dev-requirements.txt
@ -5,5 +5,5 @@ transifex-client
 raven==5.0.0

 mysqlclient==1.3.12
-pycryptodome==3.7.2
+pycryptodome
 psd-tools==1.4
--- a/fabfile/copyright.py
+++ b/fabfile/copyright.py
@ -19,15 +19,15 @@ def check(path):

 def do_update(filename):
    if 'migrations' in filename:
-        print 'skip migration file: %s' % filename
+        print('skip migration file: %s' % filename)
        return

    with open(filename) as f:
        # try read first line of file
        try:
-            head = [next(f) for x in xrange(1)]
+            head = [next(f) for x in range(1)]
        except StopIteration:
-            print '%s is empty, skip' % filename
+            print('%s is empty, skip' % filename)
            return

    copy_str = '# Copyright (c) 2012-2016 Seafile Ltd.'
@ -39,11 +39,11 @@ def do_update(filename):
            need_update = False

    if not need_update:
-        print '%s is ok.' % filename
+        print('%s is ok.' % filename)
        return

    line_prepender(filename, copy_str)
-    print '%s Done.' % filename
+    print('%s Done.' % filename)

 def path_to_pyfile_list(path):
    is_dir = False
@ -78,7 +78,7 @@ def do_check(filename):
    with open(filename) as f:
        # try read first line of file
        try:
-            head = [next(f) for x in xrange(1)]
+            head = [next(f) for x in range(1)]
        except StopIteration:
            return

@ -89,4 +89,4 @@ def do_check(filename):
            need_update = False

    if need_update:
-        print 'No copyright info in %s.' % filename
+        print('No copyright info in %s.' % filename)
--- a/fabfile/locale.py
+++ b/fabfile/locale.py
@ -18,7 +18,7 @@ def make(default=True, lang='en'):
        b2 = f.readline()

    if b1 != b2:
-        print 'Error: inconsistent Git branch names.'
+        print('Error: inconsistent Git branch names.')
        return


@ -63,7 +63,7 @@ def compile():
 def _inplace_change(filename, old_string, new_string):
    s = open(filename).read()
    if old_string in s:
-        print(green('Changing "{old_string}" to "{new_string}" in "{filename}"'.format(**locals())))
+        print((green('Changing "{old_string}" to "{new_string}" in "{filename}"'.format(**locals()))))
        s = s.replace(old_string, new_string)
        f = open(filename, 'w')
        f.write(s)
@ -71,4 +71,4 @@ def _inplace_change(filename, old_string, new_string):
        f.close()

 def _debug(msg):
-    print(red('Running: {msg}'.format(**locals())))
+    print((red('Running: {msg}'.format(**locals()))))
--- a/requirements.txt
+++ b/requirements.txt
@ -1,23 +1,20 @@
-python-dateutil==2.7.0
-python-memcached==1.57
-chardet==3.0.4
-six==1.11.0
-Pillow==4.3.0
-Django==1.11.15
-django-compressor==2.2
-git+git://github.com/haiwen/django-post_office.git@2312cf240363721f737b5ac8eb86ab8cb255938f#egg=django-post_office
-django-statici18n==1.7.0
-djangorestframework==3.3.3
-git+git://github.com/haiwen/django-constance.git@8508ff29141732190faff51d5c2b5474da297732#egg=django-constance[database]
-openpyxl==2.3.0
-pytz==2015.7
-django-formtools==2.1
-qrcode==5.3
-requests==2.20.1
-requests_oauthlib==0.8.0
-django-simple-captcha==0.5.6
-gunicorn==19.8.1
-django-webpack-loader==0.6.0
-git+git://github.com/haiwen/python-cas.git@ffc49235fd7cc32c4fdda5acfa3707e1405881df#egg=python_cas
-futures==3.2.0
-social-auth-core==1.7.0
+Django==1.11.23
+future
+captcha
+django-compressor
+django-statici18n
+django-constance
+django-post_office
+django-webpack_loader
+gunicorn
+pymysql
+django-picklefield
+openpyxl
+qrcode
+django-formtools
+django-simple-captcha
+djangorestframework
+python-dateutil
+requests
+pillow
+pyjwt
--- a/seahub/init.py
+++ b/seahub/init.py
@ -1,7 +1,9 @@
 # Copyright (c) 2012-2016 Seafile Ltd.
-from signals import repo_created, repo_deleted, clean_up_repo_trash, \
+import pymysql
+pymysql.install_as_MySQLdb()
+from .signals import repo_created, repo_deleted, clean_up_repo_trash, \
        repo_restored
-from handlers import repo_created_cb, repo_deleted_cb, clean_up_repo_trash_cb, \
+from .handlers import repo_created_cb, repo_deleted_cb, clean_up_repo_trash_cb, \
        repo_restored_cb

 repo_created.connect(repo_created_cb)
--- a/seahub/admin_log/migrations/0001_initial.py
+++ b/seahub/admin_log/migrations/0001_initial.py
@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import unicode_literals
+

 from django.db import migrations, models
 import datetime
--- a/seahub/api2/endpoints/address_book/members.py
+++ b/seahub/api2/endpoints/address_book/members.py
@ -52,7 +52,7 @@ class AddressBookGroupsSearchMember(APIView):
        email_list += search_user_from_ccnet(q)
        email_list += search_user_from_profile(q)
        # remove duplicate emails
-        email_list = {}.fromkeys(email_list).keys()
+        email_list = list({}.fromkeys(email_list).keys())

        try:
            # get all members in current group and its sub groups
@ -64,7 +64,7 @@ class AddressBookGroupsSearchMember(APIView):

        group_email_list = [m.user_name for m in all_members]
        # remove duplicate emails
-        group_email_list = {}.fromkeys(group_email_list).keys()
+        group_email_list = list({}.fromkeys(group_email_list).keys())

        email_result = []
        for email in group_email_list:
--- a/seahub/api2/endpoints/admin/account.py
+++ b/seahub/api2/endpoints/admin/account.py
@ -192,11 +192,11 @@ class Account(APIView):
        if name is not None:
            if len(name) > 64:
                return api_error(status.HTTP_400_BAD_REQUEST,
-                        _(u'Name is too long (maximum is 64 characters)'))
+                        _('Name is too long (maximum is 64 characters)'))

            if "/" in name:
                return api_error(status.HTTP_400_BAD_REQUEST,
-                        _(u"Name should not include '/'."))
+                        _("Name should not include '/'."))

        # argument check for list_in_address_book
        list_in_address_book = request.data.get("list_in_address_book", None)
@ -211,18 +211,18 @@ class Account(APIView):
            loginid = loginid.strip()
            if loginid == "":
                return api_error(status.HTTP_400_BAD_REQUEST,
-                            _(u"Login id can't be empty"))
+                            _("Login id can't be empty"))
            usernamebyloginid = Profile.objects.get_username_by_login_id(loginid)
            if usernamebyloginid is not None:
                return api_error(status.HTTP_400_BAD_REQUEST,
-                          _(u"Login id %s already exists." % loginid))
+                          _("Login id %s already exists." % loginid))

        # argument check for department
        department = request.data.get("department", None)
        if department is not None:
            if len(department) > 512:
                return api_error(status.HTTP_400_BAD_REQUEST,
-                        _(u'Department is too long (maximum is 512 characters)'))
+                        _('Department is too long (maximum is 512 characters)'))

        # argument check for institution
        institution = request.data.get("institution", None)
@ -256,7 +256,7 @@ class Account(APIView):
                        get_file_size_unit('MB')
                if space_quota_mb > org_quota_mb:
                    return api_error(status.HTTP_400_BAD_REQUEST, \
-                            _(u'Failed to set quota: maximum quota is %d MB' % org_quota_mb))
+                            _('Failed to set quota: maximum quota is %d MB' % org_quota_mb))

        # argument check for is_trial
        is_trial = request.data.get("is_trial", None)
--- a/seahub/api2/endpoints/admin/address_book/groups.py
+++ b/seahub/api2/endpoints/admin/address_book/groups.py
@ -77,14 +77,14 @@ class AdminAddressBookGroups(APIView):

        # Check whether group name is validate.
        if not validate_group_name(group_name):
-            error_msg = _(u'Name can only contain letters, numbers, blank, hyphen or underscore.')
+            error_msg = _('Name can only contain letters, numbers, blank, hyphen or underscore.')
            return api_error(status.HTTP_400_BAD_REQUEST, error_msg)

        # Check whether group name is duplicated.
        pattern_matched_groups = ccnet_api.search_groups(group_name, -1, -1)
        for group in pattern_matched_groups:
            if group.group_name == group_name:
-                error_msg = _(u'There is already a group with that name.')
+                error_msg = _('There is already a group with that name.')
                return api_error(status.HTTP_400_BAD_REQUEST, error_msg)

        # Group owner is 'system admin'
@ -228,11 +228,11 @@ class AdminAddressBookGroup(APIView):
            return api_error(status.HTTP_500_INTERNAL_SERVER_ERROR, error_msg)

        if has_repo:
-            error_msg = _(u'There are libraries in this department.')
+            error_msg = _('There are libraries in this department.')
            return api_error(status.HTTP_403_FORBIDDEN, error_msg)

        if len(child_groups) > 0:
-            error_msg = _(u'There are sub-departments in this department.')
+            error_msg = _('There are sub-departments in this department.')
            return api_error(status.HTTP_403_FORBIDDEN, error_msg)

        try:
--- a/seahub/api2/endpoints/admin/device_trusted_ip.py
+++ b/seahub/api2/endpoints/admin/device_trusted_ip.py
@ -1,4 +1,5 @@
 # Copyright (c) 2012-2016 Seafile Ltd.
+from functools import cmp_to_key

 from rest_framework.authentication import SessionAuthentication
 from rest_framework.permissions import IsAdminUser
@ -83,7 +84,7 @@ class AdminDeviceTrustedIP(APIView):
    @check_parameter
    def get(self, request, format=None):
        ip_list = [ip.to_dict() for ip in TrustedIP.objects.all()]
-        ip_list = sorted(ip_list, cmp=cmp_ip)
+        ip_list = sorted(ip_list, key=cmp_to_key(cmp_ip))
        return Response(ip_list)

    @check_parameter
--- a/seahub/api2/endpoints/admin/favicon.py
+++ b/seahub/api2/endpoints/admin/favicon.py
@ -56,7 +56,7 @@ class AdminFavicon(APIView):
                    CUSTOM_FAVICON_PATH)

            # save favicon file to custom dir
-            with open(custom_favicon_file, 'w') as fd:
+            with open(custom_favicon_file, 'wb') as fd:
                fd.write(favicon_file.read())

            custom_symlink = os.path.join(MEDIA_ROOT,
--- a/seahub/api2/endpoints/admin/file_scan_records.py
+++ b/seahub/api2/endpoints/admin/file_scan_records.py
@ -55,7 +55,7 @@ class AdminFileScanRecords(APIView):
            else:
                record["repo_name"] = repo.name
            record_detail = json.loads(record['detail'])
-            detail_dict = record_detail.values()[0]
+            detail_dict = list(record_detail.values())[0]
            detail = dict()
            detail["suggestion"] = detail_dict["suggestion"]
            detail["label"] = detail_dict["label"]
--- a/seahub/api2/endpoints/admin/group_owned_libraries.py
+++ b/seahub/api2/endpoints/admin/group_owned_libraries.py
@ -100,7 +100,7 @@ class AdminGroupOwnedLibraries(APIView):
                        storage_id=storage_id)
            else:
                # STORAGE_CLASS_MAPPING_POLICY == 'REPO_ID_MAPPING'
-                if org_id > 0:
+                if org_id and org_id > 0:
                    repo_id = seafile_api.org_add_group_owned_repo(
                        org_id, group_id, repo_name, permission, password,
                        ENCRYPTED_LIBRARY_VERSION)
@ -109,7 +109,7 @@ class AdminGroupOwnedLibraries(APIView):
                        group_id, repo_name, permission, password,
                        ENCRYPTED_LIBRARY_VERSION)
        else:
-            if org_id > 0:
+            if org_id and org_id > 0:
                repo_id = seafile_api.org_add_group_owned_repo(
                    org_id, group_id, repo_name, permission, password,
                    ENCRYPTED_LIBRARY_VERSION)
--- a/seahub/api2/endpoints/admin/groups.py
+++ b/seahub/api2/endpoints/admin/groups.py
@ -117,14 +117,14 @@ class AdminGroups(APIView):
        group_name = group_name.strip()
        # Check whether group name is validate.
        if not validate_group_name(group_name):
-            error_msg = _(u'Group name can only contain letters, numbers, blank, hyphen, dot, single quote or underscore')
+            error_msg = _('Group name can only contain letters, numbers, blank, hyphen, dot, single quote or underscore')
            return api_error(status.HTTP_400_BAD_REQUEST, error_msg)

        # Check whether group name is duplicated.
        pattern_matched_groups = ccnet_api.search_groups(group_name, -1, -1)
        for group in pattern_matched_groups:
            if group.group_name == group_name:
-                error_msg = _(u'There is already a group with that name.')
+                error_msg = _('There is already a group with that name.')
                return api_error(status.HTTP_400_BAD_REQUEST, error_msg)

        group_owner = request.data.get('group_owner', '')
@ -200,7 +200,7 @@ class AdminGroup(APIView):

            old_owner = group.creator_name
            if new_owner == old_owner:
-                error_msg = _(u'User %s is already group owner.') % new_owner
+                error_msg = _('User %s is already group owner.') % new_owner
                return api_error(status.HTTP_400_BAD_REQUEST, error_msg)

            # transfer a group
--- a/seahub/api2/endpoints/admin/libraries.py
+++ b/seahub/api2/endpoints/admin/libraries.py
@ -138,8 +138,8 @@ class AdminLibraries(APIView):
            has_next_page = False

        default_repo_id = get_system_default_repo_id()
-        repos_all = filter(lambda r: not r.is_virtual, repos_all)
-        repos_all = filter(lambda r: r.repo_id != default_repo_id, repos_all)
+        repos_all = [r for r in repos_all if not r.is_virtual]
+        repos_all = [r for r in repos_all if r.repo_id != default_repo_id]

        return_results = []

@ -253,7 +253,7 @@ class AdminLibrary(APIView):
            try:
                org_id = seafile_api.get_org_id_by_repo_id(repo_id)
                related_usernames = get_related_users_by_repo(repo_id,
-                        org_id if org_id > 0 else None)
+                        org_id if org_id and org_id > 0 else None)
            except Exception as e:
                logger.error(e)
                org_id = -1
@ -342,7 +342,7 @@ class AdminLibrary(APIView):
                return api_error(status.HTTP_404_NOT_FOUND, error_msg)

            if not new_owner_obj.permissions.can_add_repo():
-                error_msg = _(u'Transfer failed: role of %s is %s, can not add library.') % \
+                error_msg = _('Transfer failed: role of %s is %s, can not add library.') % \
                        (new_owner, new_owner_obj.role)
                return api_error(status.HTTP_403_FORBIDDEN, error_msg)

@ -363,7 +363,7 @@ class AdminLibrary(APIView):
            repo_owner = seafile_api.get_repo_owner(repo_id)

            if new_owner == repo_owner:
-                error_msg = _(u"Library can not be transferred to owner.")
+                error_msg = _("Library can not be transferred to owner.")
                return api_error(status.HTTP_400_BAD_REQUEST, error_msg)

            # get repo shared to user/group list
--- a/seahub/api2/endpoints/admin/license.py
+++ b/seahub/api2/endpoints/admin/license.py
@ -46,7 +46,7 @@ class AdminLicense(APIView):
                error_msg = 'path %s invalid.' % LICENSE_PATH
                return api_error(status.HTTP_400_BAD_REQUEST, error_msg)

-            with open(LICENSE_PATH, 'w') as fd:
+            with open(LICENSE_PATH, 'wb') as fd:
                fd.write(license_file.read())

            ccnet_api.reload_license()
--- a/seahub/api2/endpoints/admin/login_bg_image.py
+++ b/seahub/api2/endpoints/admin/login_bg_image.py
@ -56,7 +56,7 @@ class AdminLoginBgImage(APIView):
            custom_login_bg_image_file = os.path.join(SEAHUB_DATA_ROOT,
                    custom_login_bg_image_path)
            # save login background image file to custom dir
-            with open(custom_login_bg_image_file, 'w') as fd:
+            with open(custom_login_bg_image_file, 'wb') as fd:
                fd.write(image_file.read())

            custom_symlink = os.path.join(MEDIA_ROOT,
--- a/seahub/api2/endpoints/admin/org_stats.py
+++ b/seahub/api2/endpoints/admin/org_stats.py
@ -27,7 +27,7 @@ class AdminOrgStatsTraffic(APIView):
                        'link-file-upload', 'link-file-download']
        init_count = [0] * 6
        init_data = get_init_data(start_time, end_time,
-                                  dict(zip(op_type_list, init_count)))
+                                  dict(list(zip(op_type_list, init_count))))

        for e in get_org_traffic_by_day(org_id, start_time, end_time,
                                        get_time_offset()):
@ -35,7 +35,7 @@ class AdminOrgStatsTraffic(APIView):
            init_data[dt].update({op_type: count})

        res_data = []
-        for k, v in init_data.items():
+        for k, v in list(init_data.items()):
            res = {'datetime': datetime_to_isoformat_timestr(k)}
            res.update(v)
            res_data.append(res)
--- a/seahub/api2/endpoints/admin/shares.py
+++ b/seahub/api2/endpoints/admin/shares.py
@ -177,7 +177,7 @@ class AdminShares(APIView):
                if repo_owner == email:
                    result['failed'].append({
                        'user_email': email,
-                        'error_msg': _(u'User %s is already library owner.') % email
+                        'error_msg': _('User %s is already library owner.') % email
                        })

                    continue
@ -203,7 +203,7 @@ class AdminShares(APIView):
                if has_shared_to_user(repo.repo_id, path, email):
                    result['failed'].append({
                        'email': email,
-                        'error_msg': _(u'This item has been shared to %s.') % email
+                        'error_msg': _('This item has been shared to %s.') % email
                    })
                    continue

@ -260,7 +260,7 @@ class AdminShares(APIView):
                if has_shared_to_group(repo.repo_id, path, group_id):
                    result['failed'].append({
                        'group_name': group.group_name,
-                        'error_msg': _(u'This item has been shared to %s.') % group.group_name
+                        'error_msg': _('This item has been shared to %s.') % group.group_name
                        })
                    continue

--- a/seahub/api2/endpoints/admin/statistics.py
+++ b/seahub/api2/endpoints/admin/statistics.py
@ -98,7 +98,7 @@ class FileOperationsView(APIView):
                ops_modified_dict[e[0]] = e[2]

        res_data = []
-        for k, v in ops_added_dict.items():
+        for k, v in list(ops_added_dict.items()):
            res_data.append({'datetime': datetime_to_isoformat_timestr(k), 
                         'added': v, 
                         'visited': ops_visited_dict[k], 
@ -120,7 +120,7 @@ class TotalStorageView(APIView):
        init_data = get_init_data(start_time, end_time)
        for e in data:
            init_data[e[0]] = e[1]
-        for k, v in init_data.items():
+        for k, v in list(init_data.items()):
            res_data.append({'datetime': datetime_to_isoformat_timestr(k), 'total_storage': v})

        return Response(sorted(res_data, key=lambda x: x['datetime']))
@ -139,7 +139,7 @@ class ActiveUsersView(APIView):
        init_data = get_init_data(start_time, end_time)
        for e in data:
            init_data[e[0]] = e[1]
-        for k, v in init_data.items():
+        for k, v in list(init_data.items()):
            res_data.append({'datetime': datetime_to_isoformat_timestr(k), 'count': v})

        return Response(sorted(res_data, key=lambda x: x['datetime']))
@ -157,7 +157,7 @@ class SystemTrafficView(APIView):
                        'link-file-upload', 'link-file-download']
        init_count = [0] * 6
        init_data = get_init_data(start_time, end_time,
-                                  dict(zip(op_type_list, init_count)))
+                                  dict(list(zip(op_type_list, init_count))))

        for e in get_system_traffic_by_day(start_time, end_time,
                                           get_time_offset()):
@ -165,7 +165,7 @@ class SystemTrafficView(APIView):
            init_data[dt].update({op_type: count})

        res_data = []
-        for k, v in init_data.items():
+        for k, v in list(init_data.items()):
            res = {'datetime': datetime_to_isoformat_timestr(k)}
            res.update(v)
            res_data.append(res)
--- a/seahub/api2/endpoints/admin/users.py
+++ b/seahub/api2/endpoints/admin/users.py
@ -272,7 +272,7 @@ class AdminUsers(APIView):
        if IS_EMAIL_CONFIGURED and SEND_EMAIL_ON_ADDING_SYSTEM_MEMBER:
            c = {'user': request.user.username, 'email': email, 'password': password}
            try:
-                send_html_email(_(u'You are invited to join %s') % get_site_name(),
+                send_html_email(_('You are invited to join %s') % get_site_name(),
                        'sysadmin/user_add_email.html', c, None, [email])
            except Exception as e:
                logger.error(str(e))
@ -343,7 +343,7 @@ class AdminUser(APIView):
            username_by_login_id = Profile.objects.get_username_by_login_id(login_id)
            if username_by_login_id is not None:
                return api_error(status.HTTP_400_BAD_REQUEST, 
-                                 _(u"Login id %s already exists." % login_id))
+                                 _("Login id %s already exists." % login_id))

        contact_email = request.data.get("contact_email", None)
        if contact_email is not None and contact_email.strip() != '':
--- a/seahub/api2/endpoints/admin/work_weixin.py
+++ b/seahub/api2/endpoints/admin/work_weixin.py
@ -33,7 +33,6 @@ DEPARTMENT_OWNER = 'system admin'


 # # uid = corpid + '_' + userid
-# from social_django.models import UserSocialAuth
 # get departments: https://work.weixin.qq.com/api/doc#90000/90135/90208
 # get members: https://work.weixin.qq.com/api/doc#90000/90135/90200

--- a/seahub/api2/endpoints/copy_move_task.py
+++ b/seahub/api2/endpoints/copy_move_task.py
@ -147,7 +147,7 @@ class CopyMoveTaskView(APIView):

            # check if above quota for dst repo
            if seafile_api.check_quota(dst_repo_id, current_size) < 0:
-                return api_error(HTTP_443_ABOVE_QUOTA, _(u"Out of quota."))
+                return api_error(HTTP_443_ABOVE_QUOTA, _("Out of quota."))

        new_dirent_name = check_filename_with_rename(dst_repo_id,
                dst_parent_dir, src_dirent_name)
@ -162,7 +162,7 @@ class CopyMoveTaskView(APIView):
            if dirent_type == 'dir' and src_repo_id == dst_repo_id and \
                    dst_parent_dir.startswith(src_dirent_path + '/'):

-                error_msg = _(u'Can not move directory %(src)s to its subdirectory %(des)s') \
+                error_msg = _('Can not move directory %(src)s to its subdirectory %(des)s') \
                    % {'src': escape(src_dirent_path), 'des': escape(dst_parent_dir)}
                return api_error(status.HTTP_400_BAD_REQUEST, error_msg)

--- a/seahub/api2/endpoints/dir.py
+++ b/seahub/api2/endpoints/dir.py
@ -83,8 +83,8 @@ def get_dir_file_info_list(username, request_type, repo_obj, parent_dir,
        # Use dict to reduce memcache fetch cost in large for-loop.
        nickname_dict = {}
        contact_email_dict = {}
-        modifier_set = set([x.modifier for x in file_list])
-        lock_owner_set = set([x.lock_owner for x in file_list])
+        modifier_set = {x.modifier for x in file_list}
+        lock_owner_set = {x.lock_owner for x in file_list}
        for e in modifier_set | lock_owner_set:
            if e not in nickname_dict:
                nickname_dict[e] = email2nickname(e)
@ -167,8 +167,8 @@ def get_dir_file_info_list(username, request_type, repo_obj, parent_dir,

            file_info_list.append(file_info)

-    dir_info_list.sort(lambda x, y: cmp(x['name'].lower(), y['name'].lower()))
-    file_info_list.sort(lambda x, y: cmp(x['name'].lower(), y['name'].lower()))
+    dir_info_list.sort(key=lambda x: x['name'].lower())
+    file_info_list.sort(key=lambda x: x['name'].lower())

    return dir_info_list, file_info_list

@ -445,7 +445,7 @@ class DirView(APIView):
                dir_info = self.get_dir_info(repo_id, new_dir_path)
                resp = Response(dir_info)
                return resp
-            except SearpcError, e:
+            except SearpcError as e:
                logger.error(e)
                error_msg = 'Internal Server Error'
                return api_error(status.HTTP_500_INTERNAL_SERVER_ERROR, error_msg)
--- a/seahub/api2/endpoints/dir_shared_items.py
+++ b/seahub/api2/endpoints/dir_shared_items.py
@ -313,7 +313,7 @@ class DirSharedItemsEndpoint(APIView):
                if not is_valid_username(to_user):
                    result['failed'].append({
                        'email': to_user,
-                        'error_msg': _(u'username invalid.')
+                        'error_msg': _('username invalid.')
                        })
                    continue

@ -322,14 +322,14 @@ class DirSharedItemsEndpoint(APIView):
                except User.DoesNotExist:
                    result['failed'].append({
                        'email': to_user,
-                        'error_msg': _(u'User %s not found.') % to_user
+                        'error_msg': _('User %s not found.') % to_user
                        })
                    continue

                if self.has_shared_to_user(request, repo_id, path, to_user):
                    result['failed'].append({
                        'email': to_user,
-                        'error_msg': _(u'This item has been shared to %s.') % email2nickname(to_user)
+                        'error_msg': _('This item has been shared to %s.') % email2nickname(to_user)
                        })
                    continue

@ -428,7 +428,7 @@ class DirSharedItemsEndpoint(APIView):
                if self.has_shared_to_group(request, repo_id, path, gid):
                    result['failed'].append({
                        'group_name': group.group_name,
-                        'error_msg': _(u'This item has been shared to %s.') % group.group_name
+                        'error_msg': _('This item has been shared to %s.') % group.group_name
                        })
                    continue

--- a/seahub/api2/endpoints/draft_reviewer.py
+++ b/seahub/api2/endpoints/draft_reviewer.py
@ -67,7 +67,7 @@ class DraftReviewerView(APIView):
            if not is_valid_username(reviewer):
                result['failed'].append({
                    'email': reviewer,
-                    'error_msg': _(u'username invalid.')
+                    'error_msg': _('username invalid.')
                    })
                continue

@ -76,7 +76,7 @@ class DraftReviewerView(APIView):
            except User.DoesNotExist:
                result['failed'].append({
                    'email': reviewer,
-                    'error_msg': _(u'User %s not found.') % reviewer
+                    'error_msg': _('User %s not found.') % reviewer
                    })
                continue

@ -93,7 +93,7 @@ class DraftReviewerView(APIView):
            origin_file_path = posixpath.join(uuid.parent_path, uuid.filename)
            # check perm
            if seafile_api.check_permission_by_path(d.origin_repo_id, origin_file_path, reviewer) != 'rw':
-                error_msg = _(u'Permission denied.')
+                error_msg = _('Permission denied.')
                result['failed'].append({
                    'email': reviewer,
                    'error_msg': error_msg
@ -101,7 +101,7 @@ class DraftReviewerView(APIView):
                continue

            if DraftReviewer.objects.filter(draft=d, reviewer=reviewer):
-                error_msg = u'Reviewer %s has existed.' % reviewer
+                error_msg = 'Reviewer %s has existed.' % reviewer
                result['failed'].append({
                    'email': reviewer,
                    'error_msg': error_msg
--- a/seahub/api2/endpoints/dtable.py
+++ b/seahub/api2/endpoints/dtable.py
@ -50,7 +50,7 @@ class WorkspacesView(APIView):
        if is_org_context(request):
            org_id = request.user.org.org_id

-        if org_id > 0:
+        if org_id and org_id > 0:
            groups = ccnet_api.get_org_groups_by_user(org_id, username)
        else:
            groups = ccnet_api.get_groups(username, return_ancestors=True)
@ -80,7 +80,7 @@ class WorkspacesView(APIView):
                    return api_error(status.HTTP_403_FORBIDDEN, error_msg)

                try:
-                    if org_id > 0:
+                    if org_id and org_id > 0:
                        repo_id = seafile_api.create_org_repo(
                            _("My Workspace"),
                            _("My Workspace"),
@ -166,7 +166,7 @@ class DTablesView(APIView):
                org_id = request.user.org.org_id

            try:
-                if org_id > 0:
+                if org_id and org_id > 0:
                    repo_id = seafile_api.create_org_repo(
                        _("My Workspace"),
                        _("My Workspace"),
--- a/seahub/api2/endpoints/file.py
+++ b/seahub/api2/endpoints/file.py
@ -199,7 +199,7 @@ class FileView(APIView):

            try:
                seafile_api.post_empty_file(repo_id, parent_dir, new_file_name, username)
-            except SearpcError, e:
+            except SearpcError as e:
                logger.error(e)
                error_msg = 'Internal Server Error'
                return api_error(status.HTTP_500_INTERNAL_SERVER_ERROR, error_msg)
@ -572,7 +572,7 @@ class FileView(APIView):
            expire = request.data.get('expire', FILE_LOCK_EXPIRATION_DAYS)
            try:
                seafile_api.lock_file(repo_id, path, username, expire)
-            except SearpcError, e:
+            except SearpcError as e:
                logger.error(e)
                error_msg = 'Internal Server Error'
                return api_error(status.HTTP_500_INTERNAL_SERVER_ERROR, error_msg)
@ -587,7 +587,7 @@ class FileView(APIView):
                # unlock file
                try:
                    seafile_api.unlock_file(repo_id, path)
-                except SearpcError, e:
+                except SearpcError as e:
                    logger.error(e)
                    error_msg = 'Internal Server Error'
                    return api_error(status.HTTP_500_INTERNAL_SERVER_ERROR, error_msg)
@ -605,7 +605,7 @@ class FileView(APIView):
                # refresh lock file
                try:
                    seafile_api.refresh_file_lock(repo_id, path)
-                except SearpcError, e:
+                except SearpcError as e:
                    logger.error(e)
                    error_msg = 'Internal Server Error'
                    return api_error(status.HTTP_500_INTERNAL_SERVER_ERROR, error_msg)
--- a/seahub/api2/endpoints/file_tag.py
+++ b/seahub/api2/endpoints/file_tag.py
@ -253,7 +253,7 @@ class FileTagsView(APIView):
            name_list = [name.strip() for name in names.split(",")]
            for name in name_list:
                if not check_tagname(name):
-                    error_msg = _(u'Tag can only contain letters, numbers, dot, hyphen or underscore.')
+                    error_msg = _('Tag can only contain letters, numbers, dot, hyphen or underscore.')
                    return api_error(status.HTTP_400_BAD_REQUEST, error_msg)

        FileTag.objects.delete_all_filetag_by_path(repo_id, parent_path,
@ -277,7 +277,7 @@ class FileTagsView(APIView):
        name_list = [name.strip() for name in names.split(",")]
        for name in name_list:
            if not check_tagname(name):
-                error_msg = _(u'Tag can only contain letters, numbers, dot, hyphen or underscore.')
+                error_msg = _('Tag can only contain letters, numbers, dot, hyphen or underscore.')
                return api_error(status.HTTP_400_BAD_REQUEST, error_msg)

        res_tag_list = []
@ -297,10 +297,10 @@ class FileTagView(APIView):
    @check_parameter
    def delete(self, request, repo_id, parent_path, filename, name, is_dir):
        if not name or not check_tagname(name):
-            error_msg = _(u'Tag can only contain letters, numbers, dot, hyphen or underscore.')
+            error_msg = _('Tag can only contain letters, numbers, dot, hyphen or underscore.')
            return api_error(status.HTTP_400_BAD_REQUEST, error_msg)
        if FileTag.objects.delete_file_tag_by_path(repo_id,
-                parent_path,filename,is_dir,name):
+                parent_path, filename, is_dir, name):
            return Response({"success": True}, status=status.HTTP_200_OK)
        else:
            return Response({"success": True}, status=status.HTTP_202_ACCEPTED)
--- a/seahub/api2/endpoints/group_libraries.py
+++ b/seahub/api2/endpoints/group_libraries.py
@ -82,7 +82,7 @@ class GroupLibraries(APIView):
        else:
            group_repos = seafile_api.get_repos_by_group(group_id)

-        group_repos.sort(lambda x, y: cmp(y.last_modified, x.last_modified))
+        group_repos.sort(key=lambda x: x.last_modified, reverse=True)

        # get repo id owner dict
        all_repo_owner = []
--- a/seahub/api2/endpoints/group_members.py
+++ b/seahub/api2/endpoints/group_members.py
@ -91,13 +91,13 @@ class GroupMembers(APIView):

        try:
            if is_group_member(group_id, email):
-                error_msg = _(u'User %s is already a group member.') % email2nickname(email)
+                error_msg = _('User %s is already a group member.') % email2nickname(email)
                return api_error(status.HTTP_400_BAD_REQUEST, error_msg)

            if is_org_context(request):
                org_id = request.user.org.org_id
                if not ccnet_api.org_user_exists(org_id, email):
-                    error_msg = _(u'User %s not found in organization.') % email2nickname(email)
+                    error_msg = _('User %s not found in organization.') % email2nickname(email)
                    return api_error(status.HTTP_404_NOT_FOUND, error_msg)

            ccnet_api.group_add_member(group_id, username, email)
@ -290,7 +290,7 @@ class GroupMembersBulk(APIView):
                result['failed'].append({
                    'email': email,
                    'email_name': email_name,
-                    'error_msg': _(u'User %s is already a group member.') % email_name
+                    'error_msg': _('User %s is already a group member.') % email_name
                    })
                continue

@ -300,7 +300,7 @@ class GroupMembersBulk(APIView):
                result['failed'].append({
                    'email': email,
                    'email_name': email_name,
-                    'error_msg': _(u'User %s not found in organization.') % email_name
+                    'error_msg': _('User %s not found in organization.') % email_name
                    })
                continue

--- a/seahub/api2/endpoints/group_owned_libraries.py
+++ b/seahub/api2/endpoints/group_owned_libraries.py
@ -369,7 +369,7 @@ class GroupOwnedLibraryUserFolderPermission(APIView):
            if permission:
                result['failed'].append({
                    'user_email': user,
-                    'error_msg': _(u'Permission already exists.')
+                    'error_msg': _('Permission already exists.')
                })
                continue

@ -641,7 +641,7 @@ class GroupOwnedLibraryGroupFolderPermission(APIView):
            if permission:
                result['failed'].append({
                    'group_id': group_id,
-                    'error_msg': _(u'Permission already exists.')
+                    'error_msg': _('Permission already exists.')
                })
                continue

@ -914,7 +914,7 @@ class GroupOwnedLibraryUserShare(APIView):
            if not is_valid_username(to_user):
                result['failed'].append({
                    'email': to_user,
-                    'error_msg': _(u'username invalid.')
+                    'error_msg': _('username invalid.')
                    })
                continue

@ -923,14 +923,14 @@ class GroupOwnedLibraryUserShare(APIView):
            except User.DoesNotExist:
                result['failed'].append({
                    'email': to_user,
-                    'error_msg': _(u'User %s not found.') % to_user
+                    'error_msg': _('User %s not found.') % to_user
                    })
                continue

            if self.has_shared_to_user(request, repo_id, path, to_user):
                result['failed'].append({
                    'email': to_user,
-                    'error_msg': _(u'This item has been shared to %s.') % to_user
+                    'error_msg': _('This item has been shared to %s.') % to_user
                    })
                continue

@ -1198,7 +1198,7 @@ class GroupOwnedLibraryGroupShare(APIView):
            if self.has_shared_to_group(request, repo_id, path, gid):
                result['failed'].append({
                    'group_name': group.group_name,
-                    'error_msg': _(u'This item has been shared to %s.') % group.group_name
+                    'error_msg': _('This item has been shared to %s.') % group.group_name
                    })
                continue

--- a/seahub/api2/endpoints/groups.py
+++ b/seahub/api2/endpoints/groups.py
@ -41,7 +41,7 @@ logger = logging.getLogger(__name__)

 def get_group_admins(group_id):
    members = seaserv.get_group_members(group_id)
-    admin_members = filter(lambda m: m.is_staff, members)
+    admin_members = [m for m in members if m.is_staff]

    admins = []
    for u in admin_members:
@ -208,12 +208,12 @@ class Groups(APIView):

        # Check whether group name is validate.
        if not validate_group_name(group_name):
-            error_msg = _(u'Group name can only contain letters, numbers, blank, hyphen, dot, single quote or underscore')
+            error_msg = _('Group name can only contain letters, numbers, blank, hyphen, dot, single quote or underscore')
            return api_error(status.HTTP_400_BAD_REQUEST, error_msg)

        # Check whether group name is duplicated.
        if check_group_name_conflict(request, group_name):
-            error_msg = _(u'There is already a group with that name.')
+            error_msg = _('There is already a group with that name.')
            return api_error(status.HTTP_400_BAD_REQUEST, error_msg)

        # create group.
@ -284,12 +284,12 @@ class Group(APIView):

                # Check whether group name is validate.
                if not validate_group_name(new_group_name):
-                    error_msg = _(u'Group name can only contain letters, numbers, blank, hyphen or underscore')
+                    error_msg = _('Group name can only contain letters, numbers, blank, hyphen or underscore')
                    return api_error(status.HTTP_400_BAD_REQUEST, error_msg)

                # Check whether group name is duplicated.
                if check_group_name_conflict(request, new_group_name):
-                    error_msg = _(u'There is already a group with that name.')
+                    error_msg = _('There is already a group with that name.')
                    return api_error(status.HTTP_400_BAD_REQUEST, error_msg)

                seaserv.ccnet_threaded_rpc.set_group_name(group_id, new_group_name)
@ -314,7 +314,7 @@ class Group(APIView):
                    return api_error(status.HTTP_400_BAD_REQUEST, error_msg)

                if is_group_owner(group_id, new_owner):
-                    error_msg = _(u'User %s is already group owner.') % new_owner
+                    error_msg = _('User %s is already group owner.') % new_owner
                    return api_error(status.HTTP_400_BAD_REQUEST, error_msg)

                # transfer a group
--- a/seahub/api2/endpoints/move_folder_merge.py
+++ b/seahub/api2/endpoints/move_folder_merge.py
@ -169,7 +169,7 @@ class MoveFolderMergeView(APIView):
                    src_repo.version, dir_id)

            if seafile_api.check_quota(dst_repo_id, current_size) < 0:
-                return api_error(HTTP_443_ABOVE_QUOTA, _(u"Out of quota."))
+                return api_error(HTTP_443_ABOVE_QUOTA, _("Out of quota."))

        username = request.user.username
        move_folder_with_merge(username,
--- a/seahub/api2/endpoints/query_copy_move_progress.py
+++ b/seahub/api2/endpoints/query_copy_move_progress.py
@ -44,7 +44,7 @@ class QueryCopyMoveProgressView(APIView):

        # res can be None
        if not res:
-            error_msg = _(u'Error')
+            error_msg = _('Error')
            return api_error(status.HTTP_500_INTERNAL_SERVER_ERROR, error_msg)

        result = {}
--- a/seahub/api2/endpoints/related_files.py
+++ b/seahub/api2/endpoints/related_files.py
@ -215,7 +215,7 @@ class RelatedFileView(APIView):

        # permission check
        if check_folder_permission(request, repo_id, '/') != PERMISSION_READ_WRITE:
-            print check_folder_permission(request, repo_id, file_path)
+            print(check_folder_permission(request, repo_id, file_path))
            error_msg = 'Permission denied.'
            return api_error(status.HTTP_403_FORBIDDEN, error_msg)

--- a/seahub/api2/endpoints/repo_history.py
+++ b/seahub/api2/endpoints/repo_history.py
@ -129,14 +129,14 @@ class RepoHistory(APIView):
                revision_tags = []

            for tag in revision_tags:
-                if commit_tag_dict.has_key(tag.revision_id):
+                if tag.revision_id in commit_tag_dict:
                    commit_tag_dict[tag.revision_id].append(tag.tag.name)
                else:
                    commit_tag_dict[tag.revision_id] = [tag.tag.name]

        for item in items:
            item['tags'] = []
-            for commit_id, tags in commit_tag_dict.items():
+            for commit_id, tags in list(commit_tag_dict.items()):
                if commit_id == item['commit_id']:
                    item['tags'] = tags

--- a/seahub/api2/endpoints/repo_send_new_password.py
+++ b/seahub/api2/endpoints/repo_send_new_password.py
@ -41,7 +41,7 @@ class RepoSendNewPassword(APIView):

        if not ENABLE_RESET_ENCRYPTED_REPO_PASSWORD or \
                not IS_EMAIL_CONFIGURED:
-            error_msg = _(u'Feature disabled.')
+            error_msg = _('Feature disabled.')
            return api_error(status.HTTP_403_FORBIDDEN, error_msg)

        # resource check
@ -62,14 +62,14 @@ class RepoSendNewPassword(APIView):

        secret_key =  RepoSecretKey.objects.get_secret_key(repo_id)
        if not secret_key:
-            error_msg = _(u"Can not reset this library's password.")
+            error_msg = _("Can not reset this library's password.")
            return api_error(HTTP_520_OPERATION_FAILED, error_msg)

        new_password = get_random_string(10)
        try:
            seafile_api.reset_repo_passwd(repo_id, username, secret_key, new_password)
            content = {'repo_name': repo.name, 'password': new_password,}
-            send_html_email(_(u'New password of library %s') % repo.name,
+            send_html_email(_('New password of library %s') % repo.name,
                    'snippets/reset_repo_password.html', content,
                    None, [email2contact_email(username)])
        except Exception as e:
--- a/seahub/api2/endpoints/repo_set_password.py
+++ b/seahub/api2/endpoints/repo_set_password.py
@ -64,13 +64,13 @@ class RepoSetPassword(APIView):
                error_msg = 'Bad arguments'
                return api_error(status.HTTP_400_BAD_REQUEST, error_msg)
            elif e.msg == 'Incorrect password':
-                error_msg = _(u'Wrong password')
+                error_msg = _('Wrong password')
                return api_error(status.HTTP_400_BAD_REQUEST, error_msg)
            elif e.msg == 'Internal server error':
-                error_msg = _(u'Internal server error')
+                error_msg = _('Internal server error')
                return api_error(status.HTTP_500_INTERNAL_SERVER_ERROR, error_msg)
            else:
-                error_msg = _(u'Decrypt library error')
+                error_msg = _('Decrypt library error')
                return api_error(status.HTTP_500_INTERNAL_SERVER_ERROR, error_msg)

        if ENABLE_RESET_ENCRYPTED_REPO_PASSWORD:
@ -124,7 +124,7 @@ class RepoSetPassword(APIView):
                seafile_api.change_repo_passwd(repo_id, old_password, new_password, username)
            except Exception as e:
                if e.msg == 'Incorrect password':
-                    error_msg = _(u'Wrong old password')
+                    error_msg = _('Wrong old password')
                    return api_error(status.HTTP_403_FORBIDDEN, error_msg)
                else:
                    logger.error(e)
@ -157,7 +157,7 @@ class RepoSetPassword(APIView):

            secret_key =  RepoSecretKey.objects.get_secret_key(repo_id)
            if not secret_key:
-                error_msg = _(u"Can not reset this library's password.")
+                error_msg = _("Can not reset this library's password.")
                return api_error(status.HTTP_400_BAD_REQUEST, error_msg)

            try:
--- a/seahub/api2/endpoints/repo_tags.py
+++ b/seahub/api2/endpoints/repo_tags.py
@ -70,7 +70,7 @@ class RepoTagsView(APIView):
        for repo_tag in repo_tag_list:
            res = repo_tag.to_dict()
            repo_tag_id = res["repo_tag_id"]
-            if files_count.has_key(repo_tag_id):
+            if repo_tag_id in files_count:
                res["files_count"] = files_count[repo_tag_id]
            else:
                res["files_count"] = 0
--- a/seahub/api2/endpoints/repo_trash.py
+++ b/seahub/api2/endpoints/repo_trash.py
@ -112,8 +112,8 @@ class RepoTrash(APIView):
            entries_without_scan_stat = deleted_entries[0:-1]

            # sort entry by delete time
-            entries_without_scan_stat.sort(lambda x, y : cmp(y.delete_time,
-                                                             x.delete_time))
+            entries_without_scan_stat.sort(
+                key=lambda x: x.delete_time, reverse=True)

            for item in entries_without_scan_stat:
                item_info = self.get_item_info(item)
--- a/seahub/api2/endpoints/repos.py
+++ b/seahub/api2/endpoints/repos.py
@ -28,7 +28,7 @@ from seahub.utils.repo import get_repo_owner, is_repo_admin, \

 from seahub.settings import ENABLE_STORAGE_CLASSES

-from seaserv import seafile_api, send_message
+from seaserv import seafile_api

 logger = logging.getLogger(__name__)

@ -56,7 +56,7 @@ class ReposView(APIView):
        request_type_list = request.GET.getlist('type', "")
        if not request_type_list:
            # set all to True, no filter applied
-            filter_by = filter_by.fromkeys(filter_by.iterkeys(), True)
+            filter_by = filter_by.fromkeys(iter(filter_by.keys()), True)

        for request_type in request_type_list:
            request_type = request_type.strip()
@ -90,14 +90,14 @@ class ReposView(APIView):
                        ret_corrupted=True)

            # Reduce memcache fetch ops.
-            modifiers_set = set([x.last_modifier for x in owned_repos])
+            modifiers_set = {x.last_modifier for x in owned_repos}
            for e in modifiers_set:
                if e not in contact_email_dict:
                    contact_email_dict[e] = email2contact_email(e)
                if e not in nickname_dict:
                    nickname_dict[e] = email2nickname(e)

-            owned_repos.sort(lambda x, y: cmp(y.last_modify, x.last_modify))
+            owned_repos.sort(key=lambda x: x.last_modify, reverse=True)
            for r in owned_repos:

                # do not return virtual repos
@ -141,15 +141,15 @@ class ReposView(APIView):
                    get_repos_with_admin_permission(email)

            # Reduce memcache fetch ops.
-            owners_set = set([x.user for x in shared_repos])
-            modifiers_set = set([x.last_modifier for x in shared_repos])
+            owners_set = {x.user for x in shared_repos}
+            modifiers_set = {x.last_modifier for x in shared_repos}
            for e in owners_set | modifiers_set:
                if e not in contact_email_dict:
                    contact_email_dict[e] = email2contact_email(e)
                if e not in nickname_dict:
                    nickname_dict[e] = email2nickname(e)

-            shared_repos.sort(lambda x, y: cmp(y.last_modify, x.last_modify))
+            shared_repos.sort(key=lambda x: x.last_modify, reverse=True)
            for r in shared_repos:

                owner_email = r.user
@ -198,11 +198,11 @@ class ReposView(APIView):
            else:
                group_repos = seafile_api.get_group_repos_by_user(email)

-            group_repos.sort(lambda x, y: cmp(y.last_modify, x.last_modify))
+            group_repos.sort(key=lambda x: x.last_modify, reverse=True)

            # Reduce memcache fetch ops.
-            share_from_set = set([x.user for x in group_repos])
-            modifiers_set = set([x.last_modifier for x in group_repos])
+            share_from_set = {x.user for x in group_repos}
+            modifiers_set = {x.last_modifier for x in group_repos}
            for e in modifiers_set | share_from_set:
                if e not in contact_email_dict:
                    contact_email_dict[e] = email2contact_email(e)
@ -243,8 +243,8 @@ class ReposView(APIView):

            # Reduce memcache fetch ops.
            owner_set = set(all_repo_owner)
-            share_from_set = set([x.user for x in public_repos])
-            modifiers_set = set([x.last_modifier for x in public_repos])
+            share_from_set = {x.user for x in public_repos}
+            modifiers_set = {x.last_modifier for x in public_repos}
            for e in modifiers_set | share_from_set | owner_set:
                if e not in contact_email_dict:
                    contact_email_dict[e] = email2contact_email(e)
@ -276,7 +276,7 @@ class ReposView(APIView):
        timestamp = utc_dt.strftime('%Y-%m-%d %H:%M:%S')
        org_id = request.user.org.org_id if is_org_context(request) else -1
        try:
-            send_message('seahub.stats', 'user-login\t%s\t%s\t%s' % (email, timestamp, org_id))
+            seafile_api.publish_event('seahub.stats', 'user-login\t%s\t%s\t%s' % (email, timestamp, org_id))
        except Exception as e:
            logger.error('Error when sending user-login message: %s' % str(e))

--- a/seahub/api2/endpoints/repos_batch.py
+++ b/seahub/api2/endpoints/repos_batch.py
@ -488,7 +488,7 @@ class ReposBatchCopyDirView(APIView):

        # check if above quota for dst repo
        if seafile_api.check_quota(dst_repo_id, total_size) < 0:
-            return api_error(HTTP_443_ABOVE_QUOTA,  _(u"Out of quota."))
+            return api_error(HTTP_443_ABOVE_QUOTA,  _("Out of quota."))

        result = {}
        result['failed'] = []
@ -1249,18 +1249,18 @@ class ReposAsyncBatchMoveItemView(APIView):
        locked_files = get_locked_files_by_dir(request, src_repo_id, src_parent_dir)
        for dirent in src_dirents:
            # file is locked and lock owner is not current user
-            if dirent in locked_files.keys() and \
+            if dirent in list(locked_files.keys()) and \
                    locked_files[dirent] != username:
-                error_msg = _(u'File %s is locked.') % dirent
+                error_msg = _('File %s is locked.') % dirent
                return api_error(status.HTTP_403_FORBIDDEN, error_msg)

        # check sub folder permission
        folder_permission_dict = get_sub_folder_permission_by_dir(request,
                src_repo_id, src_parent_dir)
        for dirent in src_dirents:
-            if dirent in folder_permission_dict.keys() and \
+            if dirent in list(folder_permission_dict.keys()) and \
                    folder_permission_dict[dirent] != 'rw':
-                error_msg = _(u"Can't move folder %s, please check its permission.") % dirent
+                error_msg = _("Can't move folder %s, please check its permission.") % dirent
                return api_error(status.HTTP_403_FORBIDDEN, error_msg)

        # move file
@ -1468,18 +1468,18 @@ class ReposSyncBatchMoveItemView(APIView):
        locked_files = get_locked_files_by_dir(request, src_repo_id, src_parent_dir)
        for dirent in src_dirents:
            # file is locked and lock owner is not current user
-            if dirent in locked_files.keys() and \
+            if dirent in list(locked_files.keys()) and \
                    locked_files[dirent] != username:
-                error_msg = _(u'File %s is locked.') % dirent
+                error_msg = _('File %s is locked.') % dirent
                return api_error(status.HTTP_403_FORBIDDEN, error_msg)

        # check sub folder permission
        folder_permission_dict = get_sub_folder_permission_by_dir(request,
                src_repo_id, src_parent_dir)
        for dirent in src_dirents:
-            if dirent in folder_permission_dict.keys() and \
+            if dirent in list(folder_permission_dict.keys()) and \
                    folder_permission_dict[dirent] != 'rw':
-                error_msg = _(u"Can't move folder %s, please check its permission.") % dirent
+                error_msg = _("Can't move folder %s, please check its permission.") % dirent
                return api_error(status.HTTP_403_FORBIDDEN, error_msg)

        # move file
@ -1557,17 +1557,17 @@ class ReposBatchDeleteItemView(APIView):
        locked_files = get_locked_files_by_dir(request, repo_id, parent_dir)
        for dirent in dirents:
            # file is locked and lock owner is not current user
-            if dirent in locked_files.keys() and \
+            if dirent in list(locked_files.keys()) and \
                    locked_files[dirent] != username:
-                error_msg = _(u'File %s is locked.') % dirent
+                error_msg = _('File %s is locked.') % dirent
                return api_error(status.HTTP_403_FORBIDDEN, error_msg)

        # check sub folder permission
        folder_permission_dict = get_sub_folder_permission_by_dir(request, repo_id, parent_dir)
        for dirent in dirents:
-            if dirent in folder_permission_dict.keys() and \
+            if dirent in list(folder_permission_dict.keys()) and \
                    folder_permission_dict[dirent] != 'rw':
-                error_msg = _(u"Can't delete folder %s, please check its permission.") % dirent
+                error_msg = _("Can't delete folder %s, please check its permission.") % dirent
                return api_error(status.HTTP_403_FORBIDDEN, error_msg)

        # delete file
--- a/seahub/api2/endpoints/search_user.py
+++ b/seahub/api2/endpoints/search_user.py
@ -120,7 +120,7 @@ class SearchUser(APIView):
        ## search finished, now filter out some users

        # remove duplicate emails
-        email_list = {}.fromkeys(email_list).keys()
+        email_list = list({}.fromkeys(email_list).keys())

        email_result = []

--- a/seahub/api2/endpoints/send_share_link_email.py
+++ b/seahub/api2/endpoints/send_share_link_email.py
@ -30,7 +30,7 @@ class SendShareLinkView(APIView):
    def post(self, request):

        if not IS_EMAIL_CONFIGURED:
-            error_msg = _(u'Sending shared link failed. Email service is not properly configured, please contact administrator.')
+            error_msg = _('Sending shared link failed. Email service is not properly configured, please contact administrator.')
            return api_error(status.HTTP_403_FORBIDDEN, error_msg)

        # check args
@ -97,11 +97,11 @@ class SendShareLinkView(APIView):
            template = 'shared_link_email.html'

            if link.s_type == 'f':
-                c['file_shared_type'] = _(u"file")
-                title = _(u'A file is shared to you on %s') % get_site_name()
+                c['file_shared_type'] = _("file")
+                title = _('A file is shared to you on %s') % get_site_name()
            else:
-                c['file_shared_type'] = _(u"directory")
-                title = _(u'A directory is shared to you on %s') % get_site_name()
+                c['file_shared_type'] = _("directory")
+                title = _('A directory is shared to you on %s') % get_site_name()

            # send email
            try:
--- a/seahub/api2/endpoints/send_upload_link_email.py
+++ b/seahub/api2/endpoints/send_upload_link_email.py
@ -29,7 +29,7 @@ class SendUploadLinkView(APIView):
    def post(self, request):

        if not IS_EMAIL_CONFIGURED:
-            error_msg = _(u'Sending shared link failed. Email service is not properly configured, please contact administrator.')
+            error_msg = _('Sending shared link failed. Email service is not properly configured, please contact administrator.')
            return api_error(status.HTTP_403_FORBIDDEN, error_msg)

        # check args
@ -70,7 +70,7 @@ class SendUploadLinkView(APIView):

            if not is_valid_email(to_email):
                failed_info['email'] = to_email
-                failed_info['error_msg'] = _(u'email invalid.')
+                failed_info['error_msg'] = _('email invalid.')
                result['failed'].append(failed_info)
                continue

@ -92,7 +92,7 @@ class SendUploadLinkView(APIView):
                reply_to = None

            c['shared_upload_link'] = gen_shared_upload_link(token)
-            title = _(u'An upload link is shared to you on %s') % get_site_name()
+            title = _('An upload link is shared to you on %s') % get_site_name()
            template = 'shared_upload_link_email.html'

            # send email
@ -102,7 +102,7 @@ class SendUploadLinkView(APIView):
            except Exception as e:
                logger.error(e)
                failed_info['email'] = to_email
-                failed_info['error_msg'] = _(u'Internal Server Error')
+                failed_info['error_msg'] = _('Internal Server Error')
                result['failed'].append(failed_info)

        return Response(result)
--- a/seahub/api2/endpoints/share_links.py
+++ b/seahub/api2/endpoints/share_links.py
@ -93,7 +93,7 @@ def check_permissions_arg(request):
    if permissions is not None:
        if isinstance(permissions, dict):
            perm_dict = permissions
-        elif isinstance(permissions, basestring):
+        elif isinstance(permissions, str):
            import json
            try:
                perm_dict = json.loads(permissions)
@ -164,7 +164,7 @@ class ShareLinks(APIView):
                return api_error(status.HTTP_404_NOT_FOUND, error_msg)

            # filter share links by repo
-            fileshares = filter(lambda fs: fs.repo_id == repo_id, fileshares)
+            fileshares = [fs for fs in fileshares if fs.repo_id == repo_id]

            path = request.GET.get('path', None)
            if path:
@ -189,7 +189,7 @@ class ShareLinks(APIView):
                if s_type == 'd' and path[-1] != '/':
                    path = path + '/'

-                fileshares = filter(lambda fs: fs.path == path, fileshares)
+                fileshares = [fs for fs in fileshares if fs.path == path]

        links_info = []
        for fs in fileshares:
@ -199,11 +199,11 @@ class ShareLinks(APIView):
        if len(links_info) == 1:
            result = links_info
        else:
-            dir_list = filter(lambda x: x['is_dir'], links_info)
-            file_list = filter(lambda x: not x['is_dir'], links_info)
+            dir_list = [x for x in links_info if x['is_dir']]
+            file_list = [x for x in links_info if not x['is_dir']]

-            dir_list.sort(lambda x, y: cmp(x['obj_name'], y['obj_name']))
-            file_list.sort(lambda x, y: cmp(x['obj_name'], y['obj_name']))
+            dir_list.sort(key=lambda x: x['obj_name'])
+            file_list.sort(key=lambda x: x['obj_name'])

            result = dir_list + file_list

@ -297,7 +297,7 @@ class ShareLinks(APIView):
        if s_type == 'f':
            fs = FileShare.objects.get_file_link_by_path(username, repo_id, path)
            if fs:
-                error_msg = _(u'Share link %s already exists.' % fs.token)
+                error_msg = _('Share link %s already exists.' % fs.token)
                return api_error(status.HTTP_400_BAD_REQUEST, error_msg)
            fs = FileShare.objects.create_file_link(username, repo_id, path,
                                                    password, expire_date,
@ -306,7 +306,7 @@ class ShareLinks(APIView):
        elif s_type == 'd':
            fs = FileShare.objects.get_dir_link_by_path(username, repo_id, path)
            if fs:
-                error_msg = _(u'Share link %s already exists.' % fs.token)
+                error_msg = _('Share link %s already exists.' % fs.token)
                return api_error(status.HTTP_400_BAD_REQUEST, error_msg)
            fs = FileShare.objects.create_dir_link(username, repo_id, path,
                                                    password, expire_date,
@ -454,7 +454,7 @@ class ShareLinkOnlineOfficeLock(APIView):
            # refresh lock file
            try:
                seafile_api.refresh_file_lock(repo_id, path)
-            except SearpcError, e:
+            except SearpcError as e:
                logger.error(e)
                error_msg = 'Internal Server Error'
                return api_error(status.HTTP_500_INTERNAL_SERVER_ERROR, error_msg)
--- a/seahub/api2/endpoints/shared_folders.py
+++ b/seahub/api2/endpoints/shared_folders.py
@ -49,7 +49,7 @@ class SharedFolders(APIView):
            return api_error(status.HTTP_500_INTERNAL_SERVER_ERROR, error_msg)

        returned_result = []
-        shared_repos.sort(lambda x, y: cmp(x.repo_name, y.repo_name))
+        shared_repos.sort(key=lambda x: x.repo_name)
        for repo in shared_repos:
            if not repo.is_virtual:
                    continue
--- a/seahub/api2/endpoints/shared_repos.py
+++ b/seahub/api2/endpoints/shared_repos.py
@ -55,7 +55,7 @@ class SharedRepos(APIView):
            return api_error(status.HTTP_500_INTERNAL_SERVER_ERROR, error_msg)

        returned_result = []
-        shared_repos.sort(lambda x, y: cmp(x.repo_name, y.repo_name))
+        shared_repos.sort(key=lambda x: x.repo_name)
        usernames = []
        gids = []
        for repo in shared_repos:
@ -309,10 +309,10 @@ class SharedRepo(APIView):
        if share_type == 'public':
            pub_repos = []
            if org_id:
-                pub_repos = seaserv.list_org_inner_pub_repos(org_id, username)
+                pub_repos = seafile_api.list_org_inner_pub_repos(org_id)

            if not request.cloud_mode:
-                pub_repos = seaserv.list_inner_pub_repos(username)
+                pub_repos = seafile_api.get_inner_pub_repo_list()

            try:
                if org_id:
--- a/seahub/api2/endpoints/starred_items.py
+++ b/seahub/api2/endpoints/starred_items.py
@ -105,9 +105,9 @@ class StarredItems(APIView):
            else:
                starred_files.append(item_info)

-        starred_repos.sort(lambda x, y: cmp(y['mtime'], x['mtime']))
-        starred_folders.sort(lambda x, y: cmp(y['mtime'], x['mtime']))
-        starred_files.sort(lambda x, y: cmp(y['mtime'], x['mtime']))
+        starred_repos.sort(key=lambda x: x['mtime'], reverse=True)
+        starred_folders.sort(key=lambda x: x['mtime'], reverse=True)
+        starred_files.sort(key=lambda x: x['mtime'], reverse=True)

        return Response({'starred_item_list': starred_repos + \
                starred_folders + starred_files})
--- a/seahub/api2/endpoints/upload_links.py
+++ b/seahub/api2/endpoints/upload_links.py
@ -95,7 +95,7 @@ class UploadLinks(APIView):
                return api_error(status.HTTP_404_NOT_FOUND, error_msg)

            # filter share links by repo
-            upload_link_shares = filter(lambda ufs: ufs.repo_id==repo_id, upload_link_shares)
+            upload_link_shares = [ufs for ufs in upload_link_shares if ufs.repo_id==repo_id]

            path = request.GET.get('path', None)
            if path:
@ -114,7 +114,7 @@ class UploadLinks(APIView):
                    path = path + '/'

                # filter share links by path
-                upload_link_shares = filter(lambda ufs: ufs.path==path, upload_link_shares)
+                upload_link_shares = [ufs for ufs in upload_link_shares if ufs.path==path]

        result = []
        for uls in upload_link_shares:
@ -124,7 +124,7 @@ class UploadLinks(APIView):
        if len(result) == 1:
            result = result
        else:
-            result.sort(lambda x, y: cmp(x['obj_name'], y['obj_name']))
+            result.sort(key=lambda x: x['obj_name'])

        return Response(result)

--- a/seahub/api2/endpoints/user.py
+++ b/seahub/api2/endpoints/user.py
@ -54,7 +54,7 @@ class User(APIView):

        # update account telephone
        if info_dict['telephone']:
-            DetailedProfile.objects.add_or_update(email, department=None , telephone=info_dict['telephone'])
+            DetailedProfile.objects.add_or_update(email, department=None, telephone=info_dict['telephone'])

        # update user list_in_address_book
        if info_dict['list_in_address_book']:
@ -70,7 +70,7 @@ class User(APIView):
        email = request.user.username

        if not ENABLE_UPDATE_USER_INFO:
-            error_msg = _(u'Feature disabled.')
+            error_msg = _('Feature disabled.')
            return api_error(status.HTTP_403_FORBIDDEN, error_msg)

        # argument check for name
@ -78,11 +78,11 @@ class User(APIView):
        if name:
            name = name.strip()
            if len(name) > 64:
-                error_msg = _(u'Name is too long (maximum is 64 characters)')
+                error_msg = _('Name is too long (maximum is 64 characters)')
                return api_error(status.HTTP_400_BAD_REQUEST, error_msg)

            if "/" in name:
-                error_msg = _(u"Name should not include '/'.")
+                error_msg = _("Name should not include '/'.")
                return api_error(status.HTTP_400_BAD_REQUEST, error_msg)

        # argument check for contact_email
@ -90,7 +90,7 @@ class User(APIView):
        if contact_email:
            
            if not ENABLE_USER_SET_CONTACT_EMAIL:
-                error_msg = _(u'Feature disabled.')
+                error_msg = _('Feature disabled.')
                return api_error(status.HTTP_403_FORBIDDEN, error_msg)

            profile = Profile.objects.get_profile_by_contact_email(contact_email)
--- a/seahub/api2/endpoints/user_avatar.py
+++ b/seahub/api2/endpoints/user_avatar.py
@ -46,17 +46,17 @@ class UserAvatarView(APIView):

        (root, ext) = os.path.splitext(image_file.name.lower())
        if AVATAR_ALLOWED_FILE_EXTS and ext not in AVATAR_ALLOWED_FILE_EXTS:
-            error_msg = _(u"%(ext)s is an invalid file extension. Authorized extensions are : %(valid_exts_list)s") % {'ext' : ext, 'valid_exts_list' : ", ".join(AVATAR_ALLOWED_FILE_EXTS)}
+            error_msg = _("%(ext)s is an invalid file extension. Authorized extensions are : %(valid_exts_list)s") % {'ext' : ext, 'valid_exts_list' : ", ".join(AVATAR_ALLOWED_FILE_EXTS)}
            return api_error(status.HTTP_400_BAD_REQUEST, error_msg)

        if image_file.size > AVATAR_MAX_SIZE:
-            error_msg = _(u"Your file is too big (%(size)s), the maximum allowed size is %(max_valid_size)s") % { 'size' : filesizeformat(image_file.size), 'max_valid_size' : filesizeformat(AVATAR_MAX_SIZE)}
+            error_msg = _("Your file is too big (%(size)s), the maximum allowed size is %(max_valid_size)s") % { 'size' : filesizeformat(image_file.size), 'max_valid_size' : filesizeformat(AVATAR_MAX_SIZE)}
            return api_error(status.HTTP_400_BAD_REQUEST, error_msg)

        username = request.user.username
        count = Avatar.objects.filter(emailuser=username).count()
        if AVATAR_MAX_AVATARS_PER_USER > 1 and count >= AVATAR_MAX_AVATARS_PER_USER:
-            error_msg = _(u"You already have %(nb_avatars)d avatars, and the maximum allowed is %(nb_max_avatars)d.") % { 'nb_avatars' : count, 'nb_max_avatars' : AVATAR_MAX_AVATARS_PER_USER}
+            error_msg = _("You already have %(nb_avatars)d avatars, and the maximum allowed is %(nb_max_avatars)d.") % { 'nb_avatars' : count, 'nb_max_avatars' : AVATAR_MAX_AVATARS_PER_USER}
            return api_error(status.HTTP_400_BAD_REQUEST, error_msg)

        try:
--- a/seahub/api2/endpoints/utils.py
+++ b/seahub/api2/endpoints/utils.py
@ -2,7 +2,7 @@
 import re
 import datetime
 import time
-import urllib
+import urllib.request, urllib.parse, urllib.error
 import logging

 from rest_framework import status
@ -79,7 +79,7 @@ def get_user_contact_email_dict(email_list):
    email_list = set(email_list)
    user_contact_email_dict = {}
    for email in email_list:
-        if not user_contact_email_dict.has_key(email):
+        if email not in user_contact_email_dict:
            user_contact_email_dict[email] = email2contact_email(email)

    return user_contact_email_dict
@ -88,7 +88,7 @@ def get_user_name_dict(email_list):
    email_list = set(email_list)
    user_name_dict = {}
    for email in email_list:
-        if not user_name_dict.has_key(email):
+        if email not in user_name_dict:
            user_name_dict[email] = email2nickname(email)

    return user_name_dict
@ -97,7 +97,7 @@ def get_repo_dict(repo_id_list):
    repo_id_list = set(repo_id_list)
    repo_dict = {}
    for repo_id in repo_id_list:
-        if not repo_dict.has_key(repo_id):
+        if repo_id not in repo_dict:
            repo_dict[repo_id] = ''
            repo = seafile_api.get_repo(repo_id)
            if repo:
@ -110,10 +110,10 @@ def get_group_dict(group_id_list):
    group_id_list = set(group_id_list)
    group_dict = {}
    for group_id in group_id_list:
-        if not group_dict.has_key(group_id):
+        if group_id not in group_dict:
            group_dict[group_id] = ''
            group = ccnet_api.get_group(int(group_id))
-            print group
+            print(group)
            if group:
                group_dict[group_id] = group

@ -154,29 +154,29 @@ def generate_links_header_for_paginator(base_url, page, per_page, total_count, o
        else:
            return False

-    if type(option_dict) is not dict:
+    if not isinstance(option_dict, dict):
        return ''

    query_dict = {'page': 1, 'per_page': per_page}
    query_dict.update(option_dict)

    # generate first page url
-    first_page_url = base_url + '?' + urllib.urlencode(query_dict)
+    first_page_url = base_url + '?' + urllib.parse.urlencode(query_dict)

    # generate last page url
    last_page_query_dict = {'page': (total_count / per_page) + 1}
    query_dict.update(last_page_query_dict)
-    last_page_url = base_url + '?' + urllib.urlencode(query_dict)
+    last_page_url = base_url + '?' + urllib.parse.urlencode(query_dict)

    # generate next page url
    next_page_query_dict = {'page': page + 1}
    query_dict.update(next_page_query_dict)
-    next_page_url = base_url + '?' + urllib.urlencode(query_dict)
+    next_page_url = base_url + '?' + urllib.parse.urlencode(query_dict)

    # generate prev page url
    prev_page_query_dict = {'page': page - 1}
    query_dict.update(prev_page_query_dict)
-    prev_page_url = base_url + '?' + urllib.urlencode(query_dict)
+    prev_page_url = base_url + '?' + urllib.parse.urlencode(query_dict)

    # generate `Links` header
    links_header = ''
--- a/seahub/api2/endpoints/wiki_pages.py
+++ b/seahub/api2/endpoints/wiki_pages.py
@ -2,7 +2,7 @@

 import os
 import logging
-import urllib2
+import urllib.request, urllib.error, urllib.parse
 import posixpath

 from rest_framework import status
@ -61,13 +61,13 @@ class WikiPagesView(APIView):

        pages = get_wiki_pages(repo)
        wiki_pages_object = []
-        for _, page_name in pages.iteritems():
+        for _, page_name in pages.items():
            wiki_page_object = get_wiki_page_object(wiki, page_name)
            wiki_pages_object.append(wiki_page_object)

        # sort pages by name
-        wiki_pages_object.sort(lambda x, y: cmp(x['name'].lower(),
-                                                y['name'].lower()))
+        wiki_pages_object.sort(
+            key=lambda x: x['name'].lower())

        return Response({
                "data": wiki_pages_object
@ -161,7 +161,7 @@ class WikiPageView(APIView):
            return api_error(status.HTTP_404_NOT_FOUND, error_msg)

        url = get_inner_file_url(repo, wiki_dirent.obj_id, wiki_dirent.obj_name)
-        file_response = urllib2.urlopen(url)
+        file_response = urllib.request.urlopen(url)
        content = file_response.read()

        wiki_page_object = get_wiki_page_object(wiki, page_name)
@ -332,7 +332,7 @@ class WikiPageContentView(APIView):
            return api_error(status.HTTP_500_INTERNAL_SERVER_ERROR, error_msg)

        url = gen_inner_file_get_url(token, file_name)
-        file_response = urllib2.urlopen(url)
+        file_response = urllib.request.urlopen(url)
        content = file_response.read()
        
        try:
--- a/seahub/api2/endpoints/wikis.py
+++ b/seahub/api2/endpoints/wikis.py
@ -47,7 +47,7 @@ class WikisView(APIView):
        rtype = request.GET.get('type', "")
        if not rtype:
            # set all to True, no filter applied
-            filter_by = filter_by.fromkeys(filter_by.iterkeys(), True)
+            filter_by = filter_by.fromkeys(iter(filter_by.keys()), True)

        for f in rtype.split(','):
            f = f.strip()
--- a/seahub/api2/migrations/0001_initial.py
+++ b/seahub/api2/migrations/0001_initial.py
@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 # Generated by Django 1.11.11 on 2018-03-21 08:41
-from __future__ import unicode_literals
+

 from django.db import migrations, models
 import django.utils.timezone
@ -41,6 +41,6 @@ class Migration(migrations.Migration):
        ),
        migrations.AlterUniqueTogether(
            name='tokenv2',
-            unique_together=set([('user', 'platform', 'device_id')]),
+            unique_together={('user', 'platform', 'device_id')},
        ),
    ]
--- a/seahub/api2/models.py
+++ b/seahub/api2/models.py
@ -4,6 +4,9 @@ import hmac
 import datetime
 from hashlib import sha1

+import operator
+from functools import cmp_to_key
+
 from django.db import models
 from django.utils import timezone

@ -27,7 +30,7 @@ class Token(models.Model):

    def generate_key(self):
        unique = str(uuid.uuid4())
-        return hmac.new(unique, digestmod=sha1).hexdigest()
+        return hmac.new(unique.encode('utf-8'), digestmod=sha1).hexdigest()

    def __unicode__(self):
        return self.key
@ -72,13 +75,12 @@ class TokenV2Manager(models.Manager):
            the same category are listed by most recently used first

            '''
-            ret = cmp(platform_priorities[d1.platform], platform_priorities[d2.platform])
-            if ret != 0:
-                return ret
+            if operator.eq(platform_priorities[d1.platform], platform_priorities[d2.platform]):
+                return operator.lt(d2.last_accessed, d1.last_accessed)
+            else:
+                return operator.lt(platform_priorities[d1.platform], platform_priorities[d2.platform])

-            return cmp(d2.last_accessed, d1.last_accessed)
-
-        return [ d.as_dict() for d in sorted(devices, sort_devices) ]
+        return [ d.as_dict() for d in sorted(devices, key=cmp_to_key(sort_devices)) ]

    def _get_token_by_user_device(self, username, platform, device_id):
        try:
@ -172,11 +174,11 @@ class TokenV2(models.Model):

    def generate_key(self):
        unique = str(uuid.uuid4())
-        return hmac.new(unique, digestmod=sha1).hexdigest()
+        return hmac.new(unique.encode('utf-8'), digestmod=sha1).hexdigest()

    def __unicode__(self):
        return "TokenV2{user=%(user)s,device=%(device_name)s}" % \
-            dict(user=self.user,device_name=self.device_name)
+            dict(user=self.user, device_name=self.device_name)

    def is_desktop_client(self):
        return str(self.platform) in ('windows', 'linux', 'mac')
--- a/seahub/api2/throttling.py
+++ b/seahub/api2/throttling.py
@ -2,7 +2,7 @@
 """
 Provides various throttling policies.
 """
-from __future__ import unicode_literals
+
 from django.conf import settings
 from django.core.cache import cache as default_cache
 from django.core.exceptions import ImproperlyConfigured
--- a/seahub/api2/utils.py
+++ b/seahub/api2/utils.py
@ -104,12 +104,12 @@ def get_groups(email):
        if len(msg) >= 1:
            mtime = get_timestamp(msg[0].timestamp)
        group = {
-            "id":g.id,
-            "name":g.group_name,
-            "creator":g.creator_name,
-            "ctime":g.timestamp,
-            "mtime":mtime,
-            "msgnum":grpmsgs[g.id],
+            "id": g.id,
+            "name": g.group_name,
+            "creator": g.creator_name,
+            "ctime": g.timestamp,
+            "mtime": mtime,
+            "msgnum": grpmsgs[g.id],
            }
        group_json.append(group)

@ -227,11 +227,11 @@ def group_msg_to_json(msg, get_all_replies):
    replies = []
    for reply in msg.replies:
        r = {
-            'from_email' : reply.from_email,
-            'nickname' : email2nickname(reply.from_email),
-            'timestamp' : get_timestamp(reply.timestamp),
-            'msg' : reply.message,
-            'msgid' : reply.id,
+            'from_email': reply.from_email,
+            'nickname': email2nickname(reply.from_email),
+            'timestamp': get_timestamp(reply.timestamp),
+            'msg': reply.message,
+            'msgid': reply.id,
            }
        replies.append(r)

--- a/seahub/api2/views.py
+++ b/seahub/api2/views.py
@ -9,7 +9,7 @@ import datetime
 import posixpath
 import re
 from dateutil.relativedelta import relativedelta
-from urllib2 import quote
+from urllib.parse import quote

 from rest_framework import parsers
 from rest_framework import status
@ -129,13 +129,13 @@ except ImportError:
 from pysearpc import SearpcError, SearpcObjEncoder
 import seaserv
 from seaserv import seafserv_threaded_rpc, \
-    get_personal_groups_by_user, get_session_info, is_personal_repo, \
-    get_repo, check_permission, get_commits, is_passwd_set,\
+    get_personal_groups_by_user, is_personal_repo, \
+    get_repo, check_permission, get_commits,\
    check_quota, list_share_repos, get_group_repos_by_owner, get_group_repoids, \
    remove_share, get_group, \
    get_commit, get_file_id_by_path, MAX_DOWNLOAD_DIR_SIZE, edit_repo, \
    ccnet_threaded_rpc, get_personal_groups, seafile_api, \
-    create_org, ccnet_api, send_message
+    create_org, ccnet_api

 from constance import config

@ -345,11 +345,11 @@ class AccountInfo(APIView):
        if name is not None:
            if len(name) > 64:
                return api_error(status.HTTP_400_BAD_REQUEST,
-                        _(u'Name is too long (maximum is 64 characters)'))
+                        _('Name is too long (maximum is 64 characters)'))

            if "/" in name:
                return api_error(status.HTTP_400_BAD_REQUEST,
-                        _(u"Name should not include '/'."))
+                        _("Name should not include '/'."))

        email_interval = request.data.get("email_notification_interval", None)
        if email_interval is not None:
@ -524,7 +524,7 @@ class Search(APIView):
            suffixes = []
            if len(custom_ftypes) > 0:
                for ftp in custom_ftypes:
-                    if SEARCH_FILEEXT.has_key(ftp):
+                    if ftp in SEARCH_FILEEXT:
                        for ext in SEARCH_FILEEXT[ftp]:
                            suffixes.append(ext)

@ -590,7 +590,7 @@ class Search(APIView):
                e['permission'] = permission

            # get repo type
-            if repo_type_map.has_key(repo_id):
+            if repo_id in repo_type_map:
                e['repo_type'] = repo_type_map[repo_id]
            else:
                e['repo_type'] = ''
@ -605,7 +605,7 @@ def repo_download_info(request, repo_id, gen_sync_token=True):
        return api_error(status.HTTP_404_NOT_FOUND, 'Library not found.')

    # generate download url for client
-    relay_id = get_session_info().id
+    relay_id = 0
    addr, port = get_ccnet_server_addr_port()
    email = request.user.username
    if gen_sync_token:
@ -670,7 +670,7 @@ class Repos(APIView):
        rtype = request.GET.get('type', "")
        if not rtype:
            # set all to True, no filter applied
-            filter_by = filter_by.fromkeys(filter_by.iterkeys(), True)
+            filter_by = filter_by.fromkeys(iter(filter_by.keys()), True)

        for f in rtype.split(','):
            f = f.strip()
@ -695,14 +695,14 @@ class Repos(APIView):
                        ret_corrupted=True)

            # Reduce memcache fetch ops.
-            modifiers_set = set([x.last_modifier for x in owned_repos])
+            modifiers_set = {x.last_modifier for x in owned_repos}
            for e in modifiers_set:
                if e not in contact_email_dict:
                    contact_email_dict[e] = email2contact_email(e)
                if e not in nickname_dict:
                    nickname_dict[e] = email2nickname(e)

-            owned_repos.sort(lambda x, y: cmp(y.last_modify, x.last_modify))
+            owned_repos.sort(key=lambda x: x.last_modify, reverse=True)
            for r in owned_repos:
                # do not return virtual repos
                if r.is_virtual:
@ -753,15 +753,15 @@ class Repos(APIView):
                    get_repos_with_admin_permission(email)

            # Reduce memcache fetch ops.
-            owners_set = set([x.user for x in shared_repos])
-            modifiers_set = set([x.last_modifier for x in shared_repos])
+            owners_set = {x.user for x in shared_repos}
+            modifiers_set = {x.last_modifier for x in shared_repos}
            for e in owners_set | modifiers_set:
                if e not in contact_email_dict:
                    contact_email_dict[e] = email2contact_email(e)
                if e not in nickname_dict:
                    nickname_dict[e] = email2nickname(e)

-            shared_repos.sort(lambda x, y: cmp(y.last_modify, x.last_modify))
+            shared_repos.sort(key=lambda x: x.last_modify, reverse=True)
            for r in shared_repos:
                if q and q.lower() not in r.name.lower():
                    continue
@ -775,7 +775,7 @@ class Repos(APIView):
                    if not is_web_request(request):
                        continue

-                r.password_need = is_passwd_set(r.repo_id, email)
+                r.password_need = seafile_api.is_password_set(r.repo_id, email)
                repo = {
                    "type": "srepo",
                    "id": r.repo_id,
@ -784,7 +784,6 @@ class Repos(APIView):
                    "owner_contact_email": contact_email_dict.get(r.user, ''),
                    "name": r.repo_name,
                    "owner_nickname": nickname_dict.get(r.user, ''),
-                    "owner_name": nickname_dict.get(r.user, ''),
                    "mtime": r.last_modify,
                    "mtime_relative": translate_seahub_time(r.last_modify),
                    "modifier_email": r.last_modifier,
@ -816,11 +815,11 @@ class Repos(APIView):
            else:
                group_repos = seafile_api.get_group_repos_by_user(email)

-            group_repos.sort(lambda x, y: cmp(y.last_modify, x.last_modify))
+            group_repos.sort(key=lambda x: x.last_modify, reverse=True)

            # Reduce memcache fetch ops.
-            share_from_set = set([x.user for x in group_repos])
-            modifiers_set = set([x.last_modifier for x in group_repos])
+            share_from_set = {x.user for x in group_repos}
+            modifiers_set = {x.last_modifier for x in group_repos}
            for e in modifiers_set | share_from_set:
                if e not in contact_email_dict:
                    contact_email_dict[e] = email2contact_email(e)
@ -863,8 +862,8 @@ class Repos(APIView):
            public_repos = list_inner_pub_repos(request)

            # Reduce memcache fetch ops.
-            share_from_set = set([x.user for x in public_repos])
-            modifiers_set = set([x.last_modifier for x in public_repos])
+            share_from_set = {x.user for x in public_repos}
+            modifiers_set = {x.last_modifier for x in public_repos}
            for e in modifiers_set | share_from_set:
                if e not in contact_email_dict:
                    contact_email_dict[e] = email2contact_email(e)
@ -906,7 +905,7 @@ class Repos(APIView):
            org_id = request.user.org.org_id

        try:
-            send_message('seahub.stats', 'user-login\t%s\t%s\t%s' % (email, timestamp, org_id))
+            seafile_api.publish_event('seahub.stats', 'user-login\t%s\t%s\t%s' % (email, timestamp, org_id))
        except Exception as e:
            logger.error('Error when sending user-login message: %s' % str(e))
        response = HttpResponse(json.dumps(repos_json), status=200,
@ -985,7 +984,7 @@ class Repos(APIView):
            return None, api_error(status.HTTP_403_FORBIDDEN,
                             'NOT allow to create encrypted library.')

-        if org_id > 0:
+        if org_id and org_id > 0:
            repo_id = seafile_api.create_org_repo(repo_name,
                    repo_desc, username, org_id, passwd,
                    enc_version=settings.ENCRYPTED_LIBRARY_VERSION)
@ -1049,7 +1048,7 @@ class Repos(APIView):
            return None, api_error(status.HTTP_400_BAD_REQUEST,
                             'You must provide magic, random_key and enc_version.')

-        if org_id > 0:
+        if org_id and org_id > 0:
            repo_id = seafile_api.create_org_enc_repo(repo_id, repo_name, repo_desc,
                                                      username, magic, random_key,
                                                      salt, enc_version, org_id)
@ -1196,7 +1195,7 @@ def set_repo_password(request, repo, password):
        if ENABLE_RESET_ENCRYPTED_REPO_PASSWORD:
            add_encrypted_repo_secret_key_to_database(repo_id, password)

-    except SearpcError, e:
+    except SearpcError as e:
        if e.msg == 'Bad arguments':
            return api_error(status.HTTP_400_BAD_REQUEST, e.msg)
        elif e.msg == 'Repo is not encrypted':
@ -1254,14 +1253,14 @@ class Repo(APIView):
        root_id = current_commit.root_id if current_commit else None

        repo_json = {
-            "type":"repo",
-            "id":repo.id,
-            "owner":owner,
-            "name":repo.name,
-            "mtime":repo.latest_modify,
-            "size":repo.size,
-            "encrypted":repo.encrypted,
-            "root":root_id,
+            "type": "repo",
+            "id": repo.id,
+            "owner": owner,
+            "name": repo.name,
+            "mtime": repo.latest_modify,
+            "size": repo.size,
+            "encrypted": repo.encrypted,
+            "root": root_id,
            "permission": check_permission(repo.id, username),
            "modifier_email": repo.last_modifier,
            "modifier_contact_email": email2contact_email(repo.last_modifier),
@ -1583,7 +1582,7 @@ class RepoOwner(APIView):
            return api_error(status.HTTP_404_NOT_FOUND, error_msg)

        if org_id and not ccnet_api.org_user_exists(org_id, new_owner):
-            error_msg = _(u'User %s not found in organization.') % new_owner
+            error_msg = _('User %s not found in organization.') % new_owner
            return api_error(status.HTTP_404_NOT_FOUND, error_msg)

        # permission check
@ -1598,12 +1597,12 @@ class RepoOwner(APIView):
            return api_error(status.HTTP_403_FORBIDDEN, error_msg)

        if not new_owner_obj.permissions.can_add_repo():
-            error_msg = _(u'Transfer failed: role of %s is %s, can not add library.') % \
+            error_msg = _('Transfer failed: role of %s is %s, can not add library.') % \
                    (new_owner, new_owner_obj.role)
            return api_error(status.HTTP_403_FORBIDDEN, error_msg)

        if new_owner == repo_owner:
-            error_msg = _(u"Library can not be transferred to owner.")
+            error_msg = _("Library can not be transferred to owner.")
            return api_error(status.HTTP_400_BAD_REQUEST, error_msg)

        pub_repos = []
@ -1741,7 +1740,7 @@ class FileBlockDownloadLinkView(APIView):
                    'You do not have permission to access this repo.')

        if check_quota(repo_id) < 0:
-            return api_error(HTTP_443_ABOVE_QUOTA, _(u"Out of quota."))
+            return api_error(HTTP_443_ABOVE_QUOTA, _("Out of quota."))

        token = seafile_api.get_fileserver_access_token(
                repo_id, file_id, 'downloadblks', request.user.username)
@ -1777,7 +1776,7 @@ class UploadLinkView(APIView):
                    'You do not have permission to access this folder.')

        if check_quota(repo_id) < 0:
-            return api_error(HTTP_443_ABOVE_QUOTA, _(u"Out of quota."))
+            return api_error(HTTP_443_ABOVE_QUOTA, _("Out of quota."))

        token = seafile_api.get_fileserver_access_token(repo_id,
                'dummy', 'upload', request.user.username, use_onetime=False)
@ -1825,7 +1824,7 @@ class UpdateLinkView(APIView):
                    'You do not have permission to access this folder.')

        if check_quota(repo_id) < 0:
-            return api_error(HTTP_443_ABOVE_QUOTA, _(u"Out of quota."))
+            return api_error(HTTP_443_ABOVE_QUOTA, _("Out of quota."))

        token = seafile_api.get_fileserver_access_token(repo_id,
                'dummy', 'update', request.user.username, use_onetime=False)
@ -1869,7 +1868,7 @@ class UploadBlksLinkView(APIView):
                    'You do not have permission to access this folder.')

        if check_quota(repo_id) < 0:
-            return api_error(HTTP_443_ABOVE_QUOTA, _(u"Out of quota."))
+            return api_error(HTTP_443_ABOVE_QUOTA, _("Out of quota."))

        token = seafile_api.get_fileserver_access_token(repo_id,
                'dummy', 'upload-blks-api', request.user.username, use_onetime=False)
@ -1914,7 +1913,7 @@ class UploadBlksLinkView(APIView):
                    'You do not have permission to access this folder.')

        if check_quota(repo_id) < 0:
-            return api_error(HTTP_443_ABOVE_QUOTA, _(u"Out of quota."))
+            return api_error(HTTP_443_ABOVE_QUOTA, _("Out of quota."))

        token = seafile_api.get_fileserver_access_token(repo_id,
                'dummy', 'upload', request.user.username, use_onetime=False)
@ -1962,7 +1961,7 @@ class UpdateBlksLinkView(APIView):
                    'You do not have permission to access this folder.')

        if check_quota(repo_id) < 0:
-            return api_error(HTTP_443_ABOVE_QUOTA, _(u"Out of quota."))
+            return api_error(HTTP_443_ABOVE_QUOTA, _("Out of quota."))

        token = seafile_api.get_fileserver_access_token(repo_id,
                'dummy', 'update-blks-api', request.user.username, use_onetime=False)
@ -2012,7 +2011,7 @@ def get_dir_file_recursively(username, repo_id, path, all_dirs):
        file_list =  [item for item in all_dirs if item['type'] == 'file']
        contact_email_dict = {}
        nickname_dict = {}
-        modifiers_set = set([x['modifier_email'] for x in file_list])
+        modifiers_set = {x['modifier_email'] for x in file_list}
        for e in modifiers_set:
            if e not in contact_email_dict:
                contact_email_dict[e] = email2contact_email(e)
@ -2042,7 +2041,7 @@ def get_dir_entrys_by_id(request, repo, path, dir_id, request_type=None):
        dirs = seafile_api.list_dir_with_perm(repo.id, path, dir_id,
                username, -1, -1)
        dirs = dirs if dirs else []
-    except SearpcError, e:
+    except SearpcError as e:
        logger.error(e)
        return api_error(HTTP_520_OPERATION_FAILED,
                         "Failed to list dir.")
@ -2084,7 +2083,7 @@ def get_dir_entrys_by_id(request, repo, path, dir_id, request_type=None):
    # Use dict to reduce memcache fetch cost in large for-loop.
    contact_email_dict = {}
    nickname_dict = {}
-    modifiers_set = set([x['modifier_email'] for x in file_list])
+    modifiers_set = {x['modifier_email'] for x in file_list}
    for e in modifiers_set:
        if e not in contact_email_dict:
            contact_email_dict[e] = email2contact_email(e)
@ -2108,8 +2107,8 @@ def get_dir_entrys_by_id(request, repo, path, dir_id, request_type=None):
        if normalize_file_path(file_path) in starred_files:
            e['starred'] = True

-    dir_list.sort(lambda x, y: cmp(x['name'].lower(), y['name'].lower()))
-    file_list.sort(lambda x, y: cmp(x['name'].lower(), y['name'].lower()))
+    dir_list.sort(key=lambda x: x['name'].lower())
+    file_list.sort(key=lambda x: x['name'].lower())

    if request_type == 'f':
        dentrys = file_list
@ -2142,7 +2141,7 @@ def get_shared_link(request, repo_id, path):

        try:
            fs.save()
-        except IntegrityError, e:
+        except IntegrityError as e:
            return api_error(status.HTTP_500_INTERNAL_SERVER_ERROR, e.msg)

    http_or_https = request.is_secure() and 'https' or 'http'
@ -2207,7 +2206,7 @@ def get_repo_file(request, repo_id, file_id, file_name, op,
 def reloaddir(request, repo, parent_dir):
    try:
        dir_id = seafile_api.get_dir_id_by_path(repo.id, parent_dir)
-    except SearpcError, e:
+    except SearpcError as e:
        logger.error(e)
        return api_error(HTTP_520_OPERATION_FAILED,
                         "Failed to get dir id by path")
@ -2260,7 +2259,7 @@ class OpDeleteView(APIView):
        allowed_file_names = []
        locked_files = get_locked_files_by_dir(request, repo_id, parent_dir)
        for file_name in file_names.split(':'):
-            if file_name not in locked_files.keys():
+            if file_name not in list(locked_files.keys()):
                # file is not locked
                allowed_file_names.append(file_name)
            elif locked_files[file_name] == username:
@ -2333,7 +2332,7 @@ class OpMoveView(APIView):
        allowed_obj_names = []
        locked_files = get_locked_files_by_dir(request, repo_id, parent_dir)
        for file_name in obj_names.split(':'):
-            if file_name not in locked_files.keys():
+            if file_name not in list(locked_files.keys()):
                # file is not locked
                allowed_obj_names.append(file_name)
            elif locked_files[file_name] == username:
@ -2373,7 +2372,7 @@ class OpMoveView(APIView):

            # check if above quota for dst repo
            if seafile_api.check_quota(dst_repo, total_size) < 0:
-                return api_error(HTTP_443_ABOVE_QUOTA, _(u"Out of quota."))
+                return api_error(HTTP_443_ABOVE_QUOTA, _("Out of quota."))

        # make new name
        dst_dirents = seafile_api.list_dir_by_path(dst_repo, dst_dir)
@ -2487,7 +2486,7 @@ class OpCopyView(APIView):

        # check if above quota for dst repo
        if seafile_api.check_quota(dst_repo, total_size) < 0:
-            return api_error(HTTP_443_ABOVE_QUOTA, _(u"Out of quota."))
+            return api_error(HTTP_443_ABOVE_QUOTA, _("Out of quota."))

        # make new name
        dst_dirents = seafile_api.list_dir_by_path(dst_repo, dst_dir)
@ -2849,7 +2848,7 @@ class FileView(APIView):
            try:
                seafile_api.rename_file(repo_id, parent_dir, oldname, newname,
                                        username)
-            except SearpcError,e:
+            except SearpcError as e:
                return api_error(HTTP_520_OPERATION_FAILED,
                                 "Failed to rename file: %s" % e)

@ -2892,7 +2891,7 @@ class FileView(APIView):
                                      dst_dir, new_filename,
                                      replace=False, username=username,
                                      need_progress=0, synchronous=1)
-            except SearpcError, e:
+            except SearpcError as e:
                return api_error(status.HTTP_500_INTERNAL_SERVER_ERROR,
                                 "SearpcError:" + e.msg)

@ -2984,7 +2983,7 @@ class FileView(APIView):
            try:
                seafile_api.post_empty_file(repo_id, parent_dir,
                                            new_file_name, username)
-            except SearpcError, e:
+            except SearpcError as e:
                return api_error(HTTP_520_OPERATION_FAILED,
                                 'Failed to create file.')

@ -3038,7 +3037,7 @@ class FileView(APIView):
            try:
                seafile_api.lock_file(repo_id, path.lstrip('/'), username, expire)
                return Response('success', status=status.HTTP_200_OK)
-            except SearpcError, e:
+            except SearpcError as e:
                logger.error(e)
                return api_error(status.HTTP_500_INTERNAL_SERVER_ERROR, 'Internal error')

@ -3052,7 +3051,7 @@ class FileView(APIView):
            try:
                seafile_api.unlock_file(repo_id, path.lstrip('/'))
                return Response('success', status=status.HTTP_200_OK)
-            except SearpcError, e:
+            except SearpcError as e:
                logger.error(e)
                return api_error(status.HTTP_500_INTERNAL_SERVER_ERROR, 'Internal error')
        else:
@ -3617,7 +3616,7 @@ class DirView(APIView):
                resp = Response('success', status=status.HTTP_201_CREATED)
                uri = reverse('DirView', args=[repo_id], request=request)
                resp['Location'] = uri + '?p=' + quote(
-                    parent_dir.encode('utf-8') + '/' + new_dir_name.encode('utf-8'))
+                    parent_dir.encode('utf-8') + '/'.encode('utf-8') + new_dir_name.encode('utf-8'))
            return resp

        elif operation.lower() == 'rename':
@ -3646,7 +3645,7 @@ class DirView(APIView):
                seafile_api.rename_file(repo_id, parent_dir, old_dir_name,
                                        checked_newname, username)
                return Response('success', status=status.HTTP_200_OK)
-            except SearpcError, e:
+            except SearpcError as e:
                logger.error(e)
                return api_error(HTTP_520_OPERATION_FAILED,
                                 'Failed to rename folder.')
@ -3786,13 +3785,13 @@ class DirSubRepoView(APIView):
                        error_msg = 'Bad arguments'
                        return api_error(status.HTTP_400_BAD_REQUEST, error_msg)
                    elif e.msg == 'Incorrect password':
-                        error_msg = _(u'Wrong password')
+                        error_msg = _('Wrong password')
                        return api_error(status.HTTP_400_BAD_REQUEST, error_msg)
                    elif e.msg == 'Internal server error':
-                        error_msg = _(u'Internal server error')
+                        error_msg = _('Internal server error')
                        return api_error(status.HTTP_500_INTERNAL_SERVER_ERROR, error_msg)
                    else:
-                        error_msg = _(u'Decrypt library error')
+                        error_msg = _('Decrypt library error')
                        return api_error(status.HTTP_500_INTERNAL_SERVER_ERROR, error_msg)

            # create sub-lib for encrypted repo
@ -3883,7 +3882,7 @@ class BeSharedRepos(APIView):
                shared_repos.append(r)

        if not CLOUD_MODE:
-            shared_repos += seaserv.list_inner_pub_repos(username)
+            shared_repos += seafile_api.get_inner_pub_repo_list()

        return HttpResponse(json.dumps(shared_repos, cls=SearpcObjEncoder),
                            status=200, content_type=json_content_type)
@ -3960,7 +3959,7 @@ class SharedFileDetailView(APIView):
            file_id = seafile_api.get_file_id_by_path(repo_id, path)
            commits = get_file_revisions_after_renamed(repo_id, path)
            c = commits[0]
-        except SearpcError, e:
+        except SearpcError as e:
            return api_error(HTTP_520_OPERATION_FAILED,
                             "Failed to get file id by path.")

@ -4089,7 +4088,7 @@ class SharedDirView(APIView):
            dirs = seafserv_threaded_rpc.list_dir_with_perm(repo_id, real_path, dir_id,
                    username, -1, -1)
            dirs = dirs if dirs else []
-        except SearpcError, e:
+        except SearpcError as e:
            logger.error(e)
            return api_error(HTTP_520_OPERATION_FAILED, "Failed to list dir.")

@ -4115,8 +4114,8 @@ class SharedDirView(APIView):
            else:
                file_list.append(entry)

-        dir_list.sort(lambda x, y: cmp(x['name'].lower(), y['name'].lower()))
-        file_list.sort(lambda x, y: cmp(x['name'].lower(), y['name'].lower()))
+        dir_list.sort(key=lambda x: x['name'].lower())
+        file_list.sort(key=lambda x: x['name'].lower())
        dentrys = dir_list + file_list

        content_type = 'application/json; charset=utf-8'
@ -4298,7 +4297,7 @@ class SharedRepo(APIView):
                try:
                    seafile_api.share_repo(repo_id, username, u, permission)
                    shared_users.append(u)
-                except SearpcError, e:
+                except SearpcError as e:
                    logger.error(e)
                    notsharable_errors.append(e)

@ -4313,7 +4312,7 @@ class SharedRepo(APIView):
                for s_user in shared_users:
                    try:
                        remove_share(repo_id, username, s_user)
-                    except SearpcError, e:
+                    except SearpcError as e:
                        # ignoring this error, go to next unsharing
                        continue

@ -4348,7 +4347,7 @@ class SharedRepo(APIView):
            try:
                seafile_api.set_group_repo(repo_id,
                        group_id, username, permission)
-            except SearpcError, e:
+            except SearpcError as e:
                return api_error(status.HTTP_500_INTERNAL_SERVER_ERROR,
                                 "Searpc Error: " + e.msg)
            try:
@ -4555,7 +4554,7 @@ class Groups(APIView):
            group_id = ccnet_api.create_group(group_name, username)
            return HttpResponse(json.dumps({'success': True, 'group_id': group_id}),
                                content_type=content_type)
-        except SearpcError, e:
+        except SearpcError as e:
            result['error'] = e.msg
            return HttpResponse(json.dumps(result), status=500,
                                content_type=content_type)
@ -4648,7 +4647,7 @@ class GroupMembers(APIView):

        try:
            ccnet_threaded_rpc.group_add_member(group.id, request.user.username, user_name)
-        except SearpcError, e:
+        except SearpcError as e:
            return api_error(status.HTTP_500_INTERNAL_SERVER_ERROR, 'Unable to add user to group')

        return HttpResponse(json.dumps({'success': True}), status=200, content_type=json_content_type)
@ -4673,7 +4672,7 @@ class GroupMembers(APIView):

        try:
            ccnet_threaded_rpc.group_remove_member(group.id, request.user.username, user_name)
-        except SearpcError, e:
+        except SearpcError as e:
            return api_error(status.HTTP_500_INTERNAL_SERVER_ERROR, 'Unable to add user to group')

        return HttpResponse(json.dumps({'success': True}), status=200, content_type=json_content_type)
@ -4783,14 +4782,14 @@ class GroupRepos(APIView):
        else:
            repos = seafile_api.get_repos_by_group(group.id)

-        repos.sort(lambda x, y: cmp(y.last_modified, x.last_modified))
+        repos.sort(key=lambda x: x.last_modified, reverse=True)
        group.is_staff = is_group_staff(group, request.user)

        # Use dict to reduce memcache fetch cost in large for-loop.
        contact_email_dict = {}
        nickname_dict = {}
-        owner_set = set([x.user for x in repos])
-        modifiers_set = set([x.modifier for x in repos])
+        owner_set = {x.user for x in repos}
+        modifiers_set = {x.modifier for x in repos}
        for e in owner_set | modifiers_set:
            if e not in contact_email_dict:
                contact_email_dict[e] = email2contact_email(e)
@ -4949,7 +4948,7 @@ class OfficeConvertQueryStatus(APIView):
                else:
                    ret['success'] = True
                    ret['status'] = d.status
-            except Exception, e:
+            except Exception as e:
                logging.exception('failed to call query_office_convert_status')
                ret['error'] = str(e)

--- a/seahub/auth/init.py
+++ b/seahub/auth/init.py
@ -19,9 +19,9 @@ def load_backend(path):
    module, attr = path[:i], path[i+1:]
    try:
        mod = import_module(module)
-    except ImportError, e:
+    except ImportError as e:
        raise ImproperlyConfigured('Error importing authentication backend %s: "%s"' % (module, e))
-    except ValueError, e:
+    except ValueError as e:
        raise ImproperlyConfigured('Error importing authentication backends. Is AUTHENTICATION_BACKENDS a correctly defined list or tuple?')
    try:
        cls = getattr(mod, attr)
--- a/seahub/auth/backends.py
+++ b/seahub/auth/backends.py
@ -194,7 +194,7 @@ class SeafileRemoteUserBackend(AuthBackend):
        """
        user_info = {}

-        for header, user_info_key in self.remote_user_attribute_map.items():
+        for header, user_info_key in list(self.remote_user_attribute_map.items()):
            value = request.META.get(header, None)
            if value:
                user_info[user_info_key] = value
--- a/seahub/auth/forms.py
+++ b/seahub/auth/forms.py
@ -112,7 +112,7 @@ class PasswordResetForm(forms.Form):
        Validates that a user exists with the given e-mail address.
        """
        if not IS_EMAIL_CONFIGURED:
-            raise forms.ValidationError(_(u'Failed to send email, email service is not properly configured, please contact administrator.'))
+            raise forms.ValidationError(_('Failed to send email, email service is not properly configured, please contact administrator.'))

        email = self.cleaned_data["email"].lower().strip()

--- a/seahub/auth/middleware.py
+++ b/seahub/auth/middleware.py
@ -122,7 +122,7 @@ class SeafileRemoteUserMiddleware(MiddlewareMixin):
        if not user:
            if not getattr(settings, 'REMOTE_USER_CREATE_UNKNOWN_USER', True):
                return render(request, 'remote_user/create_unknown_user_false.html')
-	    return render(request, 'remote_user/error.html')
+            return render(request, 'remote_user/error.html')

        if user:
            if not user.is_active:
--- a/seahub/auth/models.py
+++ b/seahub/auth/models.py
@ -1,7 +1,7 @@
 # Copyright (c) 2012-2016 Seafile Ltd.
 import datetime
 import hashlib
-import urllib
+import urllib.request, urllib.parse, urllib.error
 import logging

 # import auth
@ -21,7 +21,7 @@ def get_hexdigest(algorithm, salt, raw_password):
    Returns a string of the hexdigest of the given plaintext password and salt
    using the given algorithm ('md5', 'sha1' or 'crypt').
    """
-    raw_password, salt = smart_str(raw_password), smart_str(salt)
+    raw_password, salt = smart_str(raw_password).encode('utf-8'), smart_str(salt).encode('utf-8')
    if algorithm == 'crypt':
        try:
            import crypt
@ -65,7 +65,7 @@ class AnonymousUser(object):
        return 'AnonymousUser'

    def __str__(self):
-        return unicode(self).encode('utf-8')
+        return str(self).encode('utf-8')

    def __eq__(self, other):
        return isinstance(other, self.__class__)
@ -156,7 +156,7 @@ class SocialAuthUser(models.Model):

    class Meta:
        """Meta data"""
-        app_label = "seahub.work_weixin"
+        app_label = "base"
        unique_together = ('provider', 'uid')
        db_table = 'social_auth_usersocialauth'

--- a/seahub/auth/tokens.py
+++ b/seahub/auth/tokens.py
@ -72,7 +72,7 @@ class PasswordResetTokenGenerator(object):
        return "%s-%s" % (ts_b36, hash)

    def _num_days(self, dt):
-        return (dt - date(2001,1,1)).days
+        return (dt - date(2001, 1, 1)).days

    def _today(self):
        # Used for mocking in tests
--- a/seahub/auth/views.py
+++ b/seahub/auth/views.py
@ -217,7 +217,7 @@ def login_simple_check(request):
        raise Http404

    today = datetime.now().strftime('%Y-%m-%d')
-    expect = hashlib.md5(settings.SECRET_KEY+username+today).hexdigest()
+    expect = hashlib.md5((settings.SECRET_KEY+username+today).encode('utf-8')).hexdigest()
    if expect == random_key:
        try:
            user = User.objects.get(email=username)
@ -313,9 +313,9 @@ def password_reset(request, is_admin_site=False, template_name='registration/pas
                opts['domain_override'] = get_current_site(request).domain
            try:
                form.save(**opts)
-            except Exception, e:
+            except Exception as e:
                logger.error(str(e))
-                messages.error(request, _(u'Failed to send email, please contact administrator.'))
+                messages.error(request, _('Failed to send email, please contact administrator.'))
                return render(request, template_name, {
                        'form': form,
                        })
--- a/seahub/avatar/forms.py
+++ b/seahub/avatar/forms.py
@ -16,7 +16,7 @@ def avatar_img(avatar, size):
    if not avatar.thumbnail_exists(size):
        avatar.create_thumbnail(size)
    return mark_safe("""<img src="%s" alt="%s" width="%s" height="%s" />""" % 
-        (avatar.avatar_url(size), unicode(avatar), size, size))
+        (avatar.avatar_url(size), str(avatar), size, size))

 class UploadAvatarForm(forms.Form):

@ -40,7 +40,7 @@ class UploadAvatarForm(forms.Form):
        if AVATAR_MAX_AVATARS_PER_USER > 1 and \
           count >= AVATAR_MAX_AVATARS_PER_USER: 
            raise forms.ValidationError(
-                _(u"You already have %(nb_avatars)d avatars, and the maximum allowed is %(nb_max_avatars)d.") %
+                _("You already have %(nb_avatars)d avatars, and the maximum allowed is %(nb_max_avatars)d.") %
                { 'nb_avatars' : count, 'nb_max_avatars' : AVATAR_MAX_AVATARS_PER_USER})
        return        

--- a/seahub/avatar/management/commands/migrate_avatars_fs2db.py
+++ b/seahub/avatar/management/commands/migrate_avatars_fs2db.py
@ -32,9 +32,9 @@ class Command(BaseCommand):
        for avatar in Avatar.objects.all():
            try:
                self._save(avatar.avatar.name, avatar.avatar)
-                print "SUCCESS: migrated Avatar path=%s user=%s" % (avatar.avatar.name, avatar.emailuser)
+                print("SUCCESS: migrated Avatar path=%s user=%s" % (avatar.avatar.name, avatar.emailuser))
            except AvatarNotFoundError:
-                print "ERROR: Avatar file not found: path=%s user=%s. Skip." % (avatar.avatar.name, avatar.emailuser)
+                print("ERROR: Avatar file not found: path=%s user=%s. Skip." % (avatar.avatar.name, avatar.emailuser))
                continue

            # try:
@ -50,10 +50,10 @@ class Command(BaseCommand):
        in the name will be converted to forward '/'.
        """
        name = name.replace('\\', '/')
-        name_md5 = hashlib.md5(name).hexdigest()
+        name_md5 = hashlib.md5(name.encode('utf-8')).hexdigest()
        try:
            binary = content.read()
-        except AttributeError, IOError:
+        except AttributeError as IOError:
            raise AvatarNotFoundError

        size = len(binary)
@ -78,7 +78,7 @@ class Command(BaseCommand):
        return name

    def exists(self, name):
-        name_md5 = hashlib.md5(name).hexdigest()
+        name_md5 = hashlib.md5(name.encode('utf-8')).hexdigest()
        query = 'SELECT COUNT(*) FROM %(table)s WHERE %(name_md5_column)s = %%s'
        query %= self.__dict__
        cursor = connection.cursor()
--- a/seahub/avatar/management/commands/rebuild_avatars.py
+++ b/seahub/avatar/management/commands/rebuild_avatars.py
@ -11,5 +11,5 @@ class Command(BaseCommand):
    def handle(self, **options):
        for avatar in Avatar.objects.all():
            for size in AUTO_GENERATE_AVATAR_SIZES:
-                print "Rebuilding Avatar id=%s at size %s." % (avatar.id, size)
+                print("Rebuilding Avatar id=%s at size %s." % (avatar.id, size))
                avatar.create_thumbnail(size)
--- a/seahub/avatar/migrations/0001_initial.py
+++ b/seahub/avatar/migrations/0001_initial.py
@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 # Generated by Django 1.11.11 on 2018-03-21 08:42
-from __future__ import unicode_literals
+

 import datetime
 from django.db import migrations, models
--- a/seahub/avatar/models.py
+++ b/seahub/avatar/models.py
@ -14,10 +14,10 @@ from django.utils.encoding import smart_str
 from django.db.models import signals

 try:
-    from cStringIO import StringIO
-    dir(StringIO) # Placate PyFlakes
+    from io import BytesIO
+    dir(BytesIO) # Placate PyFlakes
 except ImportError:
-    from StringIO import StringIO
+    from io import BytesIO

 try:
    from PIL import Image
@ -39,7 +39,7 @@ def avatar_file_path(instance=None, filename=None, size=None, ext=None):
    if isinstance(instance, Avatar):
        tmppath = [AVATAR_STORAGE_DIR]
        if AVATAR_HASH_USERDIRNAMES:
-            tmp = hashlib.md5(instance.emailuser).hexdigest()
+            tmp = hashlib.md5(instance.emailuser.encode('utf-8')).hexdigest()
            tmppath.extend([tmp[0], tmp[1], tmp[2:]])
        else:
            tmppath.append(instance.emailuser)
@ -63,7 +63,7 @@ def avatar_file_path(instance=None, filename=None, size=None, ext=None):
        # File doesn't exist yet
        if AVATAR_HASH_FILENAMES:
            (root, ext) = os.path.splitext(filename)
-            filename = hashlib.md5(smart_str(filename)).hexdigest()
+            filename = hashlib.md5(smart_str(filename).encode('utf-8')).hexdigest()
            filename = filename + ext
    if size:
        tmppath.extend(['resized', str(size)])
@ -92,7 +92,7 @@ class AvatarBase(object):

        try:
            orig = self.avatar.storage.open(self.avatar.name, 'rb').read()
-            image = Image.open(StringIO(orig))
+            image = Image.open(BytesIO(orig))

            quality = quality or AVATAR_THUMB_QUALITY
            (w, h) = image.size
@ -106,7 +106,7 @@ class AvatarBase(object):
                if image.mode != "RGBA":
                    image = image.convert("RGBA")
                image = image.resize((size, size), AVATAR_RESIZE_METHOD)
-                thumb = StringIO()
+                thumb = BytesIO()
                image.save(thumb, AVATAR_THUMB_FORMAT, quality=quality)
                thumb_file = ContentFile(thumb.getvalue())
            else:
@ -141,7 +141,7 @@ class Avatar(models.Model, AvatarBase):
    date_uploaded = models.DateTimeField(default=datetime.datetime.now)
    
    def __unicode__(self):
-        return _(u'Avatar for %s') % self.emailuser
+        return _('Avatar for %s') % self.emailuser
    
    def save(self, *args, **kwargs):
        avatars = Avatar.objects.filter(emailuser=self.emailuser)
@ -169,7 +169,7 @@ class GroupAvatar(models.Model, AvatarBase):
    date_uploaded = models.DateTimeField(default=datetime.datetime.now)
    
    def __unicode__(self):
-        return _(u'Avatar for %s') % self.group_id
+        return _('Avatar for %s') % self.group_id

    def save(self, *args, **kwargs):
        super(GroupAvatar, self).save(*args, **kwargs)
--- a/seahub/avatar/templatetags/avatar_tags.py
+++ b/seahub/avatar/templatetags/avatar_tags.py
@ -1,8 +1,8 @@
 # Copyright (c) 2012-2016 Seafile Ltd.
 import logging
-import urllib
+import urllib.request, urllib.parse, urllib.error
 import hashlib
-from urlparse import urlparse
+from urllib.parse import urlparse

 from django import template
 from django.core.urlresolvers import reverse
@ -34,8 +34,8 @@ def avatar_url(user, size=AVATAR_DEFAULT_SIZE):
            if AVATAR_GRAVATAR_DEFAULT:
                params['d'] = AVATAR_GRAVATAR_DEFAULT
            return "http://www.gravatar.com/avatar/%s/?%s" % (
-                hashlib.md5(user.email).hexdigest(),
-                urllib.urlencode(params))
+                hashlib.md5(user.email.encode('utf-8')).hexdigest(),
+                urllib.parse.urlencode(params))
        else:
            url = get_default_avatar_url()

--- a/seahub/avatar/tests.py
+++ b/seahub/avatar/tests.py
@ -39,8 +39,8 @@ class AvatarTestCase(TestCase):
            'password': 'testpassword',
            }, 
        )
-        self.assertEquals(response.status_code, 302)
-        self.assert_(response['Location'].endswith(settings.LOGIN_REDIRECT_URL))        
+        self.assertEqual(response.status_code, 302)
+        self.assertTrue(response['Location'].endswith(settings.LOGIN_REDIRECT_URL))        
        
        Image.init()

@ -50,38 +50,38 @@ class AvatarTestCase(TestCase):
 class AvatarUploadTests(AvatarTestCase):
    def testNonImageUpload(self):
        response = upload_helper(self, "nonimagefile")
-        self.failUnlessEqual(response.status_code, 200)
-        self.failIfEqual(response.context['upload_avatar_form'].errors, {})
+        self.assertEqual(response.status_code, 200)
+        self.assertNotEqual(response.context['upload_avatar_form'].errors, {})
        
    def testNormalImageUpload(self):
        response = upload_helper(self, "test.png")
-        self.failUnlessEqual(response.status_code, 200)
-        self.failUnlessEqual(len(response.redirect_chain), 1)
-        self.failUnlessEqual(response.context['upload_avatar_form'].errors, {})
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(len(response.redirect_chain), 1)
+        self.assertEqual(response.context['upload_avatar_form'].errors, {})
        avatar = get_primary_avatar(self.user) 
       
-        self.failIfEqual(avatar, None)
+        self.assertNotEqual(avatar, None)
        
    def testImageWithoutExtension(self):
        # use with AVATAR_ALLOWED_FILE_EXTS = ('.jpg', '.png')
        response = upload_helper(self, "imagefilewithoutext")
-        self.failUnlessEqual(response.status_code, 200)
-        self.failUnlessEqual(len(response.redirect_chain), 0) # Redirect only if it worked        
-        self.failIfEqual(response.context['upload_avatar_form'].errors, {})
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(len(response.redirect_chain), 0) # Redirect only if it worked        
+        self.assertNotEqual(response.context['upload_avatar_form'].errors, {})
        
    def testImageWithWrongExtension(self):
        # use with AVATAR_ALLOWED_FILE_EXTS = ('.jpg', '.png')
        response = upload_helper(self, "imagefilewithwrongext.ogg")
-        self.failUnlessEqual(response.status_code, 200)
-        self.failUnlessEqual(len(response.redirect_chain), 0) # Redirect only if it worked        
-        self.failIfEqual(response.context['upload_avatar_form'].errors, {})
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(len(response.redirect_chain), 0) # Redirect only if it worked        
+        self.assertNotEqual(response.context['upload_avatar_form'].errors, {})
        
    def testImageTooBig(self):
        # use with AVATAR_MAX_SIZE = 1024 * 1024
        response = upload_helper(self, "testbig.png")
-        self.failUnlessEqual(response.status_code, 200)
-        self.failUnlessEqual(len(response.redirect_chain), 0) # Redirect only if it worked        
-        self.failIfEqual(response.context['upload_avatar_form'].errors, {})
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(len(response.redirect_chain), 0) # Redirect only if it worked        
+        self.assertNotEqual(response.context['upload_avatar_form'].errors, {})
    
    def testDefaultUrl(self):
        response = self.client.get(reverse('avatar_render_primary', kwargs={
@ -97,13 +97,13 @@ class AvatarUploadTests(AvatarTestCase):

    def testNonExistingUser(self):
        a = get_primary_avatar("nonexistinguser@mail.com")
-        self.failUnlessEqual(a, None)
+        self.assertEqual(a, None)
        
    def testThereCanBeOnlyOnePrimaryAvatar(self):
        for i in range(1, 10):
            self.testNormalImageUpload()
        count = Avatar.objects.filter(emailuser=self.user, primary=True).count()
-        self.failUnlessEqual(count, 1)
+        self.assertEqual(count, 1)
        
    # def testDeleteAvatar(self):
    #     self.testNormalImageUpload()
--- a/seahub/avatar/views.py
+++ b/seahub/avatar/views.py
@ -34,11 +34,11 @@ def _get_next(request):
    3. If Django can determine the previous page from the HTTP headers, the view will
    redirect to that previous page.
    """
-    next = request.POST.get('next', request.GET.get('next',
+    next_page = request.POST.get('next', request.GET.get('next',
        request.META.get('HTTP_REFERER', None)))
-    if not next:
-        next = request.path
-    return next
+    if not next_page:
+        next_page = request.path
+    return next_page

 def _get_avatars(user):
    # Default set. Needs to be sliced, but that's it. Keep the natural order.
@ -148,10 +148,10 @@ def delete(request, extra_context=None, next_override=None, *args, **kwargs):
    if request.method == 'POST':
        if delete_avatar_form.is_valid():
            ids = delete_avatar_form.cleaned_data['choices']
-            if unicode(avatar.id) in ids and avatars.count() > len(ids):
+            if str(avatar.id) in ids and avatars.count() > len(ids):
                # Find the next best avatar, and set it as the new primary
                for a in avatars:
-                    if unicode(a.id) not in ids:
+                    if str(a.id) not in ids:
                        a.primary = True
                        a.save()
                        avatar_updated.send(sender=Avatar, user=request.user, avatar=avatar)
--- a/seahub/base/accounts.py
+++ b/seahub/base/accounts.py
@ -11,7 +11,7 @@ from django.utils.translation import ugettext_lazy as _
 from django.conf import settings
 from django.contrib.sites.shortcuts import get_current_site
 import seaserv
-from seaserv import ccnet_threaded_rpc, unset_repo_passwd, is_passwd_set, \
+from seaserv import ccnet_threaded_rpc, unset_repo_passwd, \
    seafile_api, ccnet_api
 from constance import config
 from registration import signals
@ -89,14 +89,14 @@ class UserManager(object):

    def get(self, email=None, id=None):
        if not email and not id:
-            raise User.DoesNotExist, 'User matching query does not exits.'
+            raise User.DoesNotExist('User matching query does not exits.')

        if email:
            emailuser = ccnet_threaded_rpc.get_emailuser(email)
        if id:
            emailuser = ccnet_threaded_rpc.get_emailuser_by_id(id)
        if not emailuser:
-            raise User.DoesNotExist, 'User matching query does not exits.'
+            raise User.DoesNotExist('User matching query does not exits.')

        user = User(emailuser.email)
        user.id = emailuser.id
@ -510,7 +510,7 @@ class User(object):
        passwd_setted_repos = []
        for r in owned_repos + shared_repos + groups_repos + public_repos:
            if not has_repo(passwd_setted_repos, r) and r.encrypted and \
-                    is_passwd_set(r.id, self.email):
+                    seafile_api.is_password_set(r.id, self.email):
                passwd_setted_repos.append(r)

        for r in passwd_setted_repos:
@ -532,7 +532,7 @@ class User(object):
        passwd_setted_repos = []
        for r in owned_repos + shared_repos + groups_repos + public_repos:
            if not has_repo(passwd_setted_repos, r) and r.encrypted and \
-                    is_passwd_set(r.id, self.email):
+                    seafile_api.is_password_set(r.id, self.email):
                passwd_setted_repos.append(r)

        for r in passwd_setted_repos:
@ -543,7 +543,7 @@ class AuthBackend(object):
    def get_user_with_import(self, username):
        emailuser = seaserv.get_emailuser_with_import(username)
        if not emailuser:
-            raise User.DoesNotExist, 'User matching query does not exits.'
+            raise User.DoesNotExist('User matching query does not exits.')

        user = User(emailuser.email)
        user.id = emailuser.id
--- a/seahub/base/apps.py
+++ b/seahub/base/apps.py
@ -14,6 +14,6 @@ class BaseConfig(AppConfig):
        try:
            _ = list(FileComment.objects.all()[:1].values('uuid_id'))
        except:
-            print '''
+            print('''
 Warning: File comment has changed since version 6.3, while table `base_filecomment` is not migrated yet, please consider migrate it according to v6.3.0 release note, otherwise the file comment feature will not work correctly.
-            '''
+            ''')
--- a/seahub/base/database_storage/init.py
+++ b/seahub/base/database_storage/init.py
@ -2,4 +2,4 @@
 # Allow users to: from database_storage import DatabaseStorage
 # (reduce redundancy a little bit)

-from database_storage import *
+from .database_storage import *
--- a/seahub/base/database_storage/database_storage.py
+++ b/seahub/base/database_storage/database_storage.py
@ -10,8 +10,8 @@ from django.db import connection, transaction

 import base64
 import hashlib
-import StringIO
-import urlparse
+import io
+import urllib.parse
 from datetime import datetime

 from seahub.utils.timeutils import value_to_db_datetime
@ -137,7 +137,7 @@ class DatabaseStorage(Storage):
        """
        assert mode == 'rb', "DatabaseStorage open mode must be 'rb'."

-        name_md5 = hashlib.md5(name).hexdigest()
+        name_md5 = hashlib.md5(name.encode('utf-8')).hexdigest()

        query = 'SELECT %(data_column)s FROM %(table)s ' + \
                'WHERE %(name_md5_column)s = %%s'
@ -148,7 +148,7 @@ class DatabaseStorage(Storage):
        if row is None:
            return None

-        inMemFile = StringIO.StringIO(base64.b64decode(row[0]))
+        inMemFile = io.BytesIO(base64.b64decode(row[0]))
        inMemFile.name = name
        inMemFile.mode = mode

@ -160,7 +160,7 @@ class DatabaseStorage(Storage):
        in the name will be converted to forward '/'.
        """
        name = name.replace('\\', '/')
-        name_md5 = hashlib.md5(name).hexdigest()
+        name_md5 = hashlib.md5(name.encode('utf-8')).hexdigest()
        binary = content.read()

        size = len(binary)
@ -185,7 +185,7 @@ class DatabaseStorage(Storage):
        return name

    def exists(self, name):
-        name_md5 = hashlib.md5(name).hexdigest()
+        name_md5 = hashlib.md5(name.encode('utf-8')).hexdigest()
        query = 'SELECT COUNT(*) FROM %(table)s WHERE %(name_md5_column)s = %%s'
        query %= self.__dict__
        cursor = connection.cursor()
@ -196,7 +196,7 @@ class DatabaseStorage(Storage):
    def delete(self, name):
        if self.exists(name):
            with transaction.atomic(using='default'):
-                name_md5 = hashlib.md5(name).hexdigest()
+                name_md5 = hashlib.md5(name.encode('utf-8')).hexdigest()
                query = 'DELETE FROM %(table)s WHERE %(name_md5_column)s = %%s'
                query %= self.__dict__
                connection.cursor().execute(query, [name_md5])
@ -207,12 +207,12 @@ class DatabaseStorage(Storage):
    def url(self, name):
        if self.base_url is None:
            raise ValueError("This file is not accessible via a URL.")
-        result = urlparse.urljoin(self.base_url, name).replace('\\', '/')
+        result = urllib.parse.urljoin(self.base_url, name).replace('\\', '/')
        return result

    def size(self, name):
        "Get the size of the given filename or raise ObjectDoesNotExist."
-        name_md5 = hashlib.md5(name).hexdigest()
+        name_md5 = hashlib.md5(name.encode('utf-8')).hexdigest()
        query = 'SELECT %(size_column)s FROM %(table)s ' + \
                'WHERE %(name_md5_column)s = %%s'
        query %= self.__dict__
@ -226,7 +226,7 @@ class DatabaseStorage(Storage):

    def modified_time(self, name):
        "Get the modified time of the given filename or raise ObjectDoesNotExist."
-        name_md5 = hashlib.md5(name).hexdigest()
+        name_md5 = hashlib.md5(name.encode('utf-8')).hexdigest()
        query = 'SELECT %(mtime_column)s FROM %(table)s ' + \
                'WHERE %(name_md5_column)s = %%s'
        query %= self.__dict__
--- a/seahub/base/decorators.py
+++ b/seahub/base/decorators.py
@ -4,7 +4,7 @@ from django.http import Http404, HttpResponseRedirect, HttpResponseNotAllowed
 from django.shortcuts import render

 from django.utils.http import urlquote
-from seaserv import get_repo, is_passwd_set
+from seaserv import get_repo, seafile_api

 from seahub.options.models import UserOptions, CryptoOptionNotSetError

@ -49,7 +49,7 @@ def repo_passwd_set_required(func):
    def _decorated(request, *args, **kwargs):
        repo_id = kwargs.get('repo_id', None)
        if not repo_id:
-            raise Exception, 'Repo id is not found in url.'
+            raise Exception('Repo id is not found in url.')
        repo = get_repo(repo_id)
        if not repo:
            raise Http404
@ -62,14 +62,14 @@ def repo_passwd_set_required(func):
                        })

            if (repo.enc_version == 1 or (repo.enc_version == 2 and server_crypto)) \
-                    and not is_passwd_set(repo_id, username):
+                    and not seafile_api.is_password_set(repo_id, username):
                return render(request, 'decrypt_repo_form.html', {
                        'repo': repo,
                        'next': request.get_full_path(),
                        })

            if repo.enc_version == 2 and not server_crypto:
-                return render_error(request, _(u'Files in this library can not be viewed online.'))
+                return render_error(request, _('Files in this library can not be viewed online.'))

        return func(request, *args, **kwargs)
    return _decorated
--- a/seahub/base/fields.py
+++ b/seahub/base/fields.py
@ -15,7 +15,7 @@ class ModifyingFieldDescriptor(object):
 class LowerCaseCharField(CharField):
    def to_python(self, value):
        value = super(LowerCaseCharField, self).to_python(value)
-        if isinstance(value, basestring):
+        if isinstance(value, str):
            return value.lower()
        return value
    def contribute_to_class(self, cls, name):
--- a/seahub/base/generic.py
+++ b/seahub/base/generic.py
@ -12,7 +12,7 @@ class DirectTemplateView(TemplateView):
    def get_context_data(self, **kwargs):
        context = super(self.__class__, self).get_context_data(**kwargs)
        if self.extra_context is not None:
-            for key, value in self.extra_context.items():
+            for key, value in list(self.extra_context.items()):
                if callable(value):
                    context[key] = value()
                else:
--- a/seahub/base/management/commands/changepassword.py
+++ b/seahub/base/management/commands/changepassword.py
@ -28,7 +28,7 @@ class Command(BaseCommand):
        except User.DoesNotExist:
            raise CommandError("user '%s' does not exist" % username)

-        print "Changing password for user '%s'" % u.username
+        print("Changing password for user '%s'" % u.username)

        MAX_TRIES = 3
        count = 0
@ -37,7 +37,7 @@ class Command(BaseCommand):
            p1 = self._get_pass()
            p2 = self._get_pass("Password (again): ")
            if p1 != p2:
-                print "Passwords do not match. Please try again."
+                print("Passwords do not match. Please try again.")
                count = count + 1

        if count == MAX_TRIES:
--- a/seahub/base/management/commands/clear_invalid_repo_data.py
+++ b/seahub/base/management/commands/clear_invalid_repo_data.py
@ -27,7 +27,7 @@ class Command(BaseCommand):
                       'ExtraSharePermission': ExtraSharePermission,
                       'UploadLinkShare': UploadLinkShare}

-        for table in self.tables.items():
+        for table in list(self.tables.items()):
            self.clear_table(table[0], table[1])

        self.stdout.write('All invalid repo data are deleted')
--- a/seahub/base/management/commands/createsuperuser.py
+++ b/seahub/base/management/commands/createsuperuser.py
@ -118,9 +118,9 @@ class Command(BaseCommand):
                #         username = None
            
                # Get an email
-                while 1:
+                while True:
                    if not email:
-                        email = raw_input('E-mail address: ')
+                        email = input('E-mail address: ')
                    try:
                        is_valid_email(email)
                    except exceptions.ValidationError:
@ -130,7 +130,7 @@ class Command(BaseCommand):
                        break
            
                # Get a password
-                while 1:
+                while True:
                    if not password:
                        password = getpass.getpass()
                        password2 = getpass.getpass('Password (again): ')
@ -148,4 +148,4 @@ class Command(BaseCommand):
                sys.exit(1)
        
        User.objects.create_superuser(email, password)
-        print "Superuser created successfully."
+        print("Superuser created successfully.")
--- a/seahub/base/management/commands/export_file_access_log.py
+++ b/seahub/base/management/commands/export_file_access_log.py
@ -62,7 +62,7 @@ class Command(BaseCommand):
        repo_obj_dict = {}
        repo_owner_dict = {}

-        events.sort(lambda x, y: cmp(y.timestamp, x.timestamp))
+        events.sort(key=lambda x: x.timestamp, reverse=True)
        for ev in events:
            event_type, ev.show_device = generate_file_audit_event_type(ev)

--- a/seahub/base/management/commands/migrate_file_comment.py
+++ b/seahub/base/management/commands/migrate_file_comment.py
@ -24,19 +24,19 @@ class Command(BaseCommand):
        elif 'sqlite' in engine:
            sqlite = True
        else:
-            print 'Unsupported database. Exit.'
+            print('Unsupported database. Exit.')
            return

-        print 'Start to update schema...'
+        print('Start to update schema...')

        comments = list(FileComment.objects.raw('SELECT * from base_filecomment'))

        with connection.cursor() as cursor:
            sql = 'ALTER TABLE base_filecomment RENAME TO base_filecomment_backup_%s' % (random_key())
            cursor.execute(sql)
-            print sql
+            print(sql)

-            print ''
+            print('')

            if mysql:
                sql = '''CREATE TABLE `base_filecomment` (
@ -54,23 +54,23 @@ class Command(BaseCommand):
            ''' % (random_key(), random_key(), random_key())

                cursor.execute(sql)
-                print sql
+                print(sql)

            if sqlite:
                sql = '''CREATE TABLE "base_filecomment" ("id" integer NOT NULL PRIMARY KEY AUTOINCREMENT, "author" varchar(255) NOT NULL, "comment" text NOT NULL, "created_at" datetime NOT NULL, "updated_at" datetime NOT NULL, "uuid_id" char(32) NOT NULL REFERENCES "tags_fileuuidmap" ("uuid"))
                '''
                cursor.execute(sql)
-                print sql
+                print(sql)

                sql = '''CREATE INDEX "base_filecomment_%s" ON "base_filecomment" ("author")''' % random_key()
                cursor.execute(sql)
-                print sql
+                print(sql)

                sql = '''CREATE INDEX "base_filecomment_%s" ON "base_filecomment" ("uuid_id") ''' % random_key()
                cursor.execute(sql)
-                print sql
+                print(sql)

-        print 'Start to migate comments data...'
+        print('Start to migate comments data...')
        for c in comments:
            repo_id = c.repo_id
            parent_path = c.parent_path
@ -83,15 +83,15 @@ class Command(BaseCommand):
            uuid = FileUUIDMap.objects.get_or_create_fileuuidmap(repo_id, parent_path, filename, False)
            FileComment(uuid=uuid, author=author, comment=comment,
                        created_at=created_at, updated_at=updated_at).save()
-            print 'migrated comment ID: %d' % c.pk
+            print('migrated comment ID: %d' % c.pk)

-        print 'Done'
+        print('Done')

    def handle(self, *args, **options):
        # check table column `uuid`
        try:
            res = FileComment.objects.raw('SELECT uuid_id from base_filecomment limit 1')
            if 'uuid_id' in res.columns:
-                print 'base_filecomment is already migrated, exit.'
+                print('base_filecomment is already migrated, exit.')
        except OperationalError:
            self.migrate_schema()
--- a/seahub/base/middleware.py
+++ b/seahub/base/middleware.py
@ -185,7 +185,7 @@ class UserPermissionMiddleware(object):

        request_path = request.path
        def get_permission_by_request_path(request_path, permission_url):
-            for permission, url_list in permission_url.iteritems():
+            for permission, url_list in permission_url.items():
                for url in url_list:
                    if url in request_path:
                        return permission
--- a/seahub/base/migrations/0001_initial.py
+++ b/seahub/base/migrations/0001_initial.py
@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 # Generated by Django 1.11.11 on 2018-03-21 08:42
-from __future__ import unicode_literals
+

 import datetime
 from django.db import migrations, models
@ -126,6 +126,6 @@ class Migration(migrations.Migration):
        ),
        migrations.AlterUniqueTogether(
            name='devicetoken',
-            unique_together=set([('token', 'user')]),
+            unique_together={('token', 'user')},
        ),
    ]
--- a/seahub/base/migrations/0002_reposecretkey.py
+++ b/seahub/base/migrations/0002_reposecretkey.py
@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 # Generated by Django 1.11.11 on 2018-07-10 09:33
-from __future__ import unicode_literals
+

 from django.db import migrations, models

--- a/seahub/base/migrations/0003_auto_20181016_1242.py
+++ b/seahub/base/migrations/0003_auto_20181016_1242.py
@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 # Generated by Django 1.11.15 on 2018-10-16 12:42
-from __future__ import unicode_literals
+

 from django.db import migrations, models

--- a/seahub/base/models.py
+++ b/seahub/base/models.py
@ -15,7 +15,7 @@ from seahub.utils import calc_file_path_hash, within_time_range, \
        normalize_file_path, normalize_dir_path
 from seahub.utils.timeutils import datetime_to_isoformat_timestr
 from seahub.tags.models import FileUUIDMap
-from fields import LowerCaseCharField
+from .fields import LowerCaseCharField


 # Get an instance of a logger
@ -192,7 +192,7 @@ class UserStarredFilesManager(models.Manager):
        repo_cache = {}
        for sfile in starred_files:
            # repo still exists?
-            if repo_cache.has_key(sfile.repo_id):
+            if sfile.repo_id in repo_cache:
                repo = repo_cache[sfile.repo_id]
            else:
                try:
@ -241,7 +241,7 @@ class UserStarredFilesManager(models.Manager):
                logger.error(e)
                sfile.last_modified = 0

-        ret.sort(lambda x, y: cmp(y.last_modified, x.last_modified))
+        ret.sort(key=lambda x: x.last_modified, reverse=True)

        return ret

--- a/seahub/base/profile.py
+++ b/seahub/base/profile.py
@ -26,10 +26,10 @@ THE SOFTWARE.
 try:
    import cProfile as profile
 except ImportError:
-    import profile
+    from . import profile

 import pstats
-from cStringIO import StringIO
+from io import StringIO
 from django.conf import settings

 class ProfilerMiddleware(object):
--- a/seahub/base/templatetags/rest_framework.py
+++ b/seahub/base/templatetags/rest_framework.py
@ -2,10 +2,10 @@
 from django import template
 from django.core.urlresolvers import reverse
 from django.http import QueryDict
-from django.utils.encoding import force_unicode
+from django.utils.encoding import force_text
 from django.utils.html import escape
 from django.utils.safestring import SafeData, mark_safe
-from urlparse import urlsplit, urlunsplit
+from urllib.parse import urlsplit, urlunsplit
 import re
 import string

@ -97,7 +97,7 @@ def add_class(value, css_class):
    In the case of REST Framework, the filter is used to add Bootstrap-specific
    classes to the forms.
    """
-    html = unicode(value)
+    html = str(value)
    match = class_re.search(html)
    if match:
        m = re.search(r'^%s$|^%s\s|\s%s\s|\s%s$' % (css_class, css_class,
@ -131,7 +131,7 @@ def urlize_quoted_links(text, trim_url_limit=None, nofollow=True, autoescape=Tru
    """
    trim_url = lambda x, limit=trim_url_limit: limit is not None and (len(x) > limit and ('%s...' % x[:max(0, limit - 3)])) or x
    safe_input = isinstance(text, SafeData)
-    words = word_split_re.split(force_unicode(text))
+    words = word_split_re.split(force_text(text))
    nofollow_attr = nofollow and ' rel="nofollow"' or ''
    for i, word in enumerate(words):
        match = None
@ -167,4 +167,4 @@ def urlize_quoted_links(text, trim_url_limit=None, nofollow=True, autoescape=Tru
            words[i] = mark_safe(word)
        elif autoescape:
            words[i] = escape(word)
-    return mark_safe(u''.join(words))
+    return mark_safe(''.join(words))
--- a/seahub/base/templatetags/seahub_tags.py
+++ b/seahub/base/templatetags/seahub_tags.py
@ -53,23 +53,23 @@ FILEEXT_ICON_MAP = {
    'txt': 'txt.png',

    # pdf file
-    'pdf' : 'pdf.png',
+    'pdf': 'pdf.png',

    # document file
-    'doc' : 'word.png',
-    'docx' : 'word.png',
-    'odt' : 'word.png',
-    'fodt' : 'word.png',
+    'doc': 'word.png',
+    'docx': 'word.png',
+    'odt': 'word.png',
+    'fodt': 'word.png',

-    'ppt' : 'ppt.png',
-    'pptx' : 'ppt.png',
-    'odp' : 'ppt.png',
-    'fodp' : 'ppt.png',
+    'ppt': 'ppt.png',
+    'pptx': 'ppt.png',
+    'odp': 'ppt.png',
+    'fodp': 'ppt.png',

-    'xls' : 'excel.png',
-    'xlsx' : 'excel.png',
-    'ods' : 'excel.png',
-    'fods' : 'excel.png',
+    'xls': 'excel.png',
+    'xlsx': 'excel.png',
+    'ods': 'excel.png',
+    'fods': 'excel.png',

    # video
    'mp4': 'video.png',
@ -81,25 +81,25 @@ FILEEXT_ICON_MAP = {
    'rmvb': 'video.png',

    # music file
-    'mp3' : 'music.png',
-    'oga' : 'music.png',
-    'ogg' : 'music.png',
-    'flac' : 'music.png',
-    'aac' : 'music.png',
-    'ac3' : 'music.png',
-    'wma' : 'music.png',
+    'mp3': 'music.png',
+    'oga': 'music.png',
+    'ogg': 'music.png',
+    'flac': 'music.png',
+    'aac': 'music.png',
+    'ac3': 'music.png',
+    'wma': 'music.png',

    # image file
-    'jpg' : 'pic.png',
-    'jpeg' : 'pic.png',
-    'png' : 'pic.png',
-    'svg' : 'pic.png',
-    'gif' : 'pic.png',
-    'bmp' : 'pic.png',
-    'ico' : 'pic.png',
+    'jpg': 'pic.png',
+    'jpeg': 'pic.png',
+    'png': 'pic.png',
+    'svg': 'pic.png',
+    'gif': 'pic.png',
+    'bmp': 'pic.png',
+    'ico': 'pic.png',

    # default
-    'default' : 'file.png',
+    'default': 'file.png',
 }
@register.filter(name='file_icon_filter')
 def file_icon_filter(value, size=None):
@ -109,7 +109,7 @@ def file_icon_filter(value, size=None):
    else:
        file_ext = None

-    if file_ext and FILEEXT_ICON_MAP.has_key(file_ext):
+    if file_ext and file_ext in FILEEXT_ICON_MAP:
        if size == 192:
            return '192/' + FILEEXT_ICON_MAP.get(file_ext)
        else:
@ -122,17 +122,17 @@ def file_icon_filter(value, size=None):

 # This way of translation looks silly, but works well.
 COMMIT_MSG_TRANSLATION_MAP = {
-    'Added' : _('Added'),
-    'Deleted' : _('Deleted'),
-    'Removed' : _('Removed'),
-    'Modified' : _('Modified'),
-    'Renamed' : _('Renamed'),
-    'Moved' : _('Moved'),
-    'Added directory' : _('Added directory'),
-    'Removed directory' : _('Removed directory'),
-    'Renamed directory' : _('Renamed directory'),
-    'Moved directory' : _('Moved directory'),
-    'Added or modified' : _('Added or modified'),
+    'Added': _('Added'),
+    'Deleted': _('Deleted'),
+    'Removed': _('Removed'),
+    'Modified': _('Modified'),
+    'Renamed': _('Renamed'),
+    'Moved': _('Moved'),
+    'Added directory': _('Added directory'),
+    'Removed directory': _('Removed directory'),
+    'Renamed directory': _('Renamed directory'),
+    'Moved directory': _('Moved directory'),
+    'Added or modified': _('Added or modified'),
 }
@register.filter(name='translate_commit_desc')
 def translate_commit_desc(value):
@ -164,7 +164,7 @@ def translate_commit_desc(value):
    else:
        # Use regular expression to translate commit description.
        # Commit description has two forms, e.g., 'Added "foo.txt" and 3 more files.' or 'Added "foo.txt".'
-        operations = '|'.join(COMMIT_MSG_TRANSLATION_MAP.keys())
+        operations = '|'.join(list(COMMIT_MSG_TRANSLATION_MAP.keys()))
        patt = r'(%s) "(.*)"\s?(and ([0-9]+) more (files|directories))?' % operations

        ret_list = []
@ -186,14 +186,14 @@ def translate_commit_desc(value):

            if has_more:
                if translation.get_language() == 'zh-cn':
-                    typ = u'文件' if more_type == 'files' else u'目录'
-                    ret = op_trans + u' "' + file_name + u'"以及另外' + n_files + u'个' + typ + '.'
+                    typ = '文件' if more_type == 'files' else '目录'
+                    ret = op_trans + ' "' + file_name + '"以及另外' + n_files + '个' + typ + '.'
                # elif translation.get_language() == 'ru':
                #     ret = ...
                else:
                    ret = e
            else:
-                ret = op_trans + u' "' + file_name + u'".'
+                ret = op_trans + ' "' + file_name + '".'
            ret_list.append(ret)

        return '\n'.join(ret_list)
@ -235,7 +235,7 @@ def translate_commit_desc_escape(value):
    else:
        # Use regular expression to translate commit description.
        # Commit description has two forms, e.g., 'Added "foo.txt" and 3 more files.' or 'Added "foo.txt".'
-        operations = '|'.join(COMMIT_MSG_TRANSLATION_MAP.keys())
+        operations = '|'.join(list(COMMIT_MSG_TRANSLATION_MAP.keys()))
        patt = r'(%s) "(.*)"\s?(and ([0-9]+) more (files|directories))?' % operations

        for e in value.split('\n'):
@ -258,14 +258,14 @@ def translate_commit_desc_escape(value):

            if has_more:
                if translation.get_language() == 'zh-cn':
-                    typ = u'文件' if more_type == 'files' else u'目录'
-                    ret = op_trans + u' "' + file_name + u'"以及另外' + n_files + u'个' + typ + '.'
+                    typ = '文件' if more_type == 'files' else '目录'
+                    ret = op_trans + ' "' + file_name + '"以及另外' + n_files + '个' + typ + '.'
                # elif translation.get_language() == 'ru':
                #     ret = ...
                else:
                    ret = e
            else:
-                ret = op_trans + u' "' + file_name + u'".'
+                ret = op_trans + ' "' + file_name + '".'

            # if not match, this commit desc will not convert link, so
            # escape it
@ -278,7 +278,7 @@ def translate_commit_desc_escape(value):

@register.filter(name='translate_seahub_time')
 def translate_seahub_time(value, autoescape=None):
-    if isinstance(value, int) or isinstance(value, long): # check whether value is int
+    if isinstance(value, int) or isinstance(value, int): # check whether value is int
        try:
            val = datetime.fromtimestamp(value) # convert timestamp to datetime
        except ValueError as e:
@ -461,9 +461,9 @@ def char2pinyin(value):
@register.filter(name='translate_permission')
 def translate_permission(value):
    if value == 'rw':
-        return _(u'Read-Write')
+        return _('Read-Write')
    elif value == 'r':
-        return _(u'Read-Only')
+        return _('Read-Only')
    else:
        return ''

--- a/seahub/base/utils.py
+++ b/seahub/base/utils.py
@ -3,7 +3,7 @@ import re
 import string

 from django.utils.safestring import SafeData, mark_safe
-from django.utils.encoding import force_unicode
+from django.utils.encoding import force_text
 from django.utils.functional import allow_lazy
 from django.utils.http import urlquote

@ -21,8 +21,8 @@ def escape(html):
    """
    Returns the given HTML with ampersands, quotes and angle brackets encoded.
    """
-    return mark_safe(force_unicode(html).replace('&', '&amp;').replace('<', '&lt;').replace('>', '&gt;').replace('"', '&quot;').replace("'", '&#39;'))
-escape = allow_lazy(escape, unicode)
+    return mark_safe(force_text(html).replace('&', '&amp;').replace('<', '&lt;').replace('>', '&gt;').replace('"', '&quot;').replace("'", '&#39;'))
+escape = allow_lazy(escape, str)

 ## modification of django's urlize, add '%' to safe:
 ##   urlquote('http://%s' % middle, safe='/&=:;#?+*%')
@ -47,7 +47,7 @@ def urlize(text, trim_url_limit=None, nofollow=False, autoescape=False):
    """
    trim_url = lambda x, limit=trim_url_limit: limit is not None and (len(x) > limit and ('%s...' % x[:max(0, limit - 3)])) or x
    safe_input = isinstance(text, SafeData)
-    words = word_split_re.split(force_unicode(text))
+    words = word_split_re.split(force_text(text))
    nofollow_attr = nofollow and ' rel="nofollow"' or ''
    for i, word in enumerate(words):
        match = None
@ -83,5 +83,5 @@ def urlize(text, trim_url_limit=None, nofollow=False, autoescape=False):
            words[i] = mark_safe(word)
        elif autoescape:
            words[i] = escape(word)
-    return u''.join(words)
-urlize = allow_lazy(urlize, unicode)
+    return ''.join(words)
+urlize = allow_lazy(urlize, str)
--- a/Show More
+++ b/Show More