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+
+# Back to our app: worker.py
+
+Let's follow our app from code to deployment in a container.
+
+During each step we'll analyze the software and show some highlights.
+
+---
+
+Step 1: The code
+
+```python
+import logging
+import os
+from redis import Redis
+import requests
+import time
+...
+redis = Redis("redis")
+...
+def work_loop(interval=1):
+    deadline = 0
+    loops_done = 0
+    while True:
+        if time.time() > deadline:
+            log.info("{} units of work done, updating hash counter"
+                     .format(loops_done))
+            redis.incrby("hashes", loops_done)
+            loops_done = 0
+            deadline = time.time() + interval
+        work_once()
+        loops_done += 1
+
+if __name__ == "__main__":
+    while True:
+        try:
+            work_loop()
+        except:
+            log.exception("In work loop:")
+            log.error("Waiting 10s and restarting.")
+            time.sleep(10)
+```