diff --git a/seahub/api2/endpoints/admin/two_factor_auth.py b/seahub/api2/endpoints/admin/two_factor_auth.py
index 0bc2ad7e97..8e357c62fd 100644
--- a/seahub/api2/endpoints/admin/two_factor_auth.py
+++ b/seahub/api2/endpoints/admin/two_factor_auth.py
@@ -9,7 +9,7 @@ from seahub.api2.base import APIView
 from seahub.api2.throttling import UserRateThrottle
 from seahub.api2.utils import json_response, api_error
 from seahub.api2.authentication import TokenAuthentication
-from seahub.utils.two_factor_auth import has_two_factor_auth, two_factor_auth_enabled
+from seahub.utils.two_factor_auth import two_factor_auth_enabled
 
 
 class TwoFactorAuthView(APIView):
@@ -22,14 +22,14 @@ class TwoFactorAuthView(APIView):
             error_msg = "email can not be empty"
             return api_error(status.HTTP_400_BAD_REQUEST, error_msg)
         try:
-            _user = User.objects.get(email=email)
+            user = User.objects.get(email=email)
         except User.DoesNotExist:
             error_msg = "User %s not found" % email
             return api_error(status.HTTP_400_BAD_REQUEST, error_msg)
 
         from seahub_extra.two_factor import devices_for_user
-        devices = devices_for_user(_user)
+        devices = devices_for_user(user)
         if devices:
             for device in devices:
                 device.delete()
-        return Response({'success':True}, status=status.HTTP_200_OK)
+        return Response({'success': True}, status=status.HTTP_200_OK)
diff --git a/seahub/views/sysadmin.py b/seahub/views/sysadmin.py
index bb958303d9..fe00b6c964 100644
--- a/seahub/views/sysadmin.py
+++ b/seahub/views/sysadmin.py
@@ -675,12 +675,12 @@ def user_info(request, email):
         else:
             g.role = _('Member')
 
-    _default_device = False
-    _has_two_factor_auth = has_two_factor_auth()
-    if _has_two_factor_auth:
+    default_device = False
+    bool_has_two_factor_auth = has_two_factor_auth()
+    if bool_has_two_factor_auth:
         from seahub_extra.two_factor.utils import default_device
-        _user = User.objects.get(email=email)
-        _default_device = default_device(_user)
+        user = User.objects.get(email=email)
+        default_device = default_device(user)
 
     return render_to_response(
         'sysadmin/userinfo.html', {
@@ -695,8 +695,8 @@ def user_info(request, email):
             'user_shared_links': user_shared_links,
             'enable_sys_admin_view_repo': ENABLE_SYS_ADMIN_VIEW_REPO,
             'personal_groups': personal_groups,
-            'two_factor_auth_enabled': _has_two_factor_auth,
-            'default_device': _default_device,
+            'two_factor_auth_enabled': bool_has_two_factor_auth,
+            'default_device': default_device,
         }, context_instance=RequestContext(request))
 
 @login_required_ajax