timer examples

concurrency/timer_cb.py

@@ -0,0 +1,23 @@
+import asyncio
+
+def show_remaining(loop):
+    if not hasattr(show_remaining, 'remaining'):
+        show_remaining.remaining = 5
+
+    print('Remaining: ', show_remaining.remaining)
+    show_remaining.remaining -= 1
+    if show_remaining.remaining:
+        loop.call_later(1, show_remaining, loop)
+    else:
+        loop.stop()
+
+def main():
+    loop = asyncio.get_event_loop()
+    try:
+        loop.call_soon(show_remaining, loop)
+        loop.run_forever()
+    finally:
+        loop.close()
+
+if __name__ == '__main__':
+    main()