New submission from Ilya Kulakov:
Currently if one needs lazily resolve event loop depending on where awaitable
is being awaited have to pass loop everywhere explicitly. That quickly becomes
an unnecessary noise in interfaces of callables.
Consider an example where a coroutine which constructs other awaitables can be
executed in arbitrary loop:
import asyncio
import datetime
async def foo_coro(loop):
await some_other_coro(loop)
async def bar_coro(loop):
await asyncio.ensure_future(..., loop=loop)
async def baz_coro(loop):
await asyncio.gather(foo_coro(loop), bar_coro(loop), loop=loop)
loop = asyncio.get_event_loop()
loop.run_until_complete(multiple_coros(loop))
loop.close()
It would be nice, if all functions that belong to an event loop instance as
well as asyncio helpers that accept a loop would set default event loop to one
that was passed to these functions. So that the example above could be
rewritten as:
import asyncio
import datetime
async def foo_coro():
await some_other_coro()
async def bar_coro():
await asyncio.ensure_future(...)
async def baz_coro():
await asyncio.gather(foo_coro(), bar_coro())
loop = asyncio.get_event_loop()
loop.run_until_complete(multiple_coros())
loop.close()
----------
components: asyncio
messages: 264941
nosy: Ilya.Kulakov, gvanrossum, haypo, yselivanov
priority: normal
severity: normal
status: open
title: ascynio should provide a policy to address pass-loop-everywhere problem
type: enhancement
versions: Python 3.4, Python 3.5, Python 3.6
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Python tracker <[email protected]>
<http://bugs.python.org/issue26969>
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