Document several patterns for using Job.

examples/job/work-queue-2/worker.py

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+#!/usr/bin/env python
+
+# Copyright 2015 The Kubernetes Authors All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import time
+import rediswq
+
+host="redis"
+# Uncomment next two lines if you do not have Kube-DNS working.
+# import os
+# host = os.getenv("REDIS_SERVICE_HOST")
+
+q = rediswq.RedisWQ(name="job2", host="redis")
+print("Worker with sessionID: " +  q.sessionID())
+print("Inital queue state: empty=" + str(q.empty()))
+while not q.empty():
+  item = q.lease(lease_secs=10, block=True, timeout=2) 
+  if item is not None:
+    itemstr = item.decode("utf=8")
+    print("Working on " + itemstr)
+    time.sleep(10) # Put your actual work here instead of sleep.
+    q.complete(item)
+  else:
+    print("Waiting for work")
+print("Queue empty, exiting")