-
-
Save ottolotto/3253d77e9cd283234dc4 to your computer and use it in GitHub Desktop.
an illustration of the difference between "yield from" and "create_task" in asyncio
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| import asyncio | |
| import random | |
| @asyncio.coroutine | |
| def print_whenever(identifier): | |
| """a little function that prints at random intervals""" | |
| while True: | |
| yield from asyncio.sleep(random.choice([0.5, 1, 1.3])) | |
| print('hi from', identifier) | |
| @asyncio.coroutine | |
| def start_things(): | |
| """start several little printey functions at the same time""" | |
| for i in range(5): | |
| # this works - it kicks off our printer "in the background" | |
| asyncio.get_event_loop().create_task( | |
| print_whenever(i) | |
| ) | |
| # this doesn't -- it never gets past the first item | |
| # yield from print_whenever(i) | |
| # tell asyncio to start running start_things | |
| loop = asyncio.get_event_loop() | |
| loop.create_task(start_things()) | |
| loop.run_forever() |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment