New submission from Hrvoje Nikšić <hnik...@gmail.com>:
The docs of SelectorEventLoop and ProactorEventLoop contain examples that call
asyncio.set_event_loop:
selector = selectors.SelectSelector()
loop = asyncio.SelectorEventLoop(selector)
asyncio.set_event_loop(loop)
But this won't have any effect on code that uses asyncio.run(), because
asyncio.run() creates a fresh event loop. Since asyncio.run() is the
recommended way to execute async code and is used consistently throughout the
documentation, this might be confusing to someone who tries to e.g. use the
proactor loop on Windows.
I propose the following:
* add a disclaimer that instantiating the event loop won't affect calls to
asyncio.run(), and that loop.run_until_complete() must be used; and
* link to asyncio.set_event_loop_policy(), which does work with asyncio.run(),
but doesn't allow fine-tuning the details, such as which selector to use for
the SelectorEventLoop.
----------
assignee: docs@python
components: Documentation, asyncio
messages: 354288
nosy: asvetlov, docs@python, hniksic, yselivanov
priority: normal
severity: normal
status: open
title: Event loop implementation docs advertise set_event_loop
versions: Python 3.7, Python 3.8, Python 3.9
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue38423>
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