timer examples

concurrency/timer.py

@@ -0,0 +1,19 @@
+import asyncio
+
+@asyncio.coroutine
+def show_remaining():
+    remaining = 5
+    while remaining:
+        print('Remaining: ', remaining)
+        yield from asyncio.sleep(1)
+        remaining -= 1
+
+def main():
+    loop = asyncio.get_event_loop()
+    try:
+        loop.run_until_complete(show_remaining())
+    finally:
+        loop.close()
+
+if __name__ == '__main__':
+    main()

concurrency/timer2.py

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+import asyncio
+import sys
+import contextlib
+
+@asyncio.coroutine
+def show_remaining(dots_task):
+    remaining = 5
+    while remaining:
+        print('Remaining: ', remaining)
+        sys.stdout.flush()
+        yield from asyncio.sleep(1)
+        remaining -= 1
+    dots_task.cancel()
+    print()
+
+@asyncio.coroutine
+def dots():
+    while True:
+        print('.', sep='', end='')
+        sys.stdout.flush()
+        yield from asyncio.sleep(.1)
+
+def main():
+    with contextlib.closing(asyncio.get_event_loop()) as loop:
+        dots_task = asyncio.Task(dots())
+        coros = [show_remaining(dots_task), dots_task]
+        loop.run_until_complete(asyncio.wait(coros))
+
+if __name__ == '__main__':
+    main()

concurrency/timer_cb.py

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+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()