New submission from Dima Tisnek <dim...@gmail.com>:
Consider this illegal code:
import logging
from asyncio import sleep, gather, run
from contextlib import asynccontextmanager
@asynccontextmanager
async def foo():
await sleep(1)
yield
async def test():
f = foo()
await gather(f.__aenter__(), f.__aenter__())
run(test())
If it's ran with Python 3.9, user gets a sensible error:
File
"/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/contextlib.py",
line 175, in __aenter__
return await self.gen.__anext__()
RuntimeError: anext(): asynchronous generator is already running
However, if it's ran with Python 3.10, user gets a cryptic error:
File
"/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/contextlib.py",
line 197, in __aenter__
del self.args, self.kwds, self.func
AttributeError: args
Which makes it harder to pinpoint what's wrong when the stack is complex.
I've hit this with fastapi/starlette/mangum combo and a custom middleware.
----------
components: asyncio
messages: 407799
nosy: Dima.Tisnek, asvetlov, yselivanov
priority: normal
severity: normal
status: open
title: Worse error from asynccontextmanager in Python 3.10
type: behavior
versions: Python 3.10, Python 3.11
_______________________________________
Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue45996>
_______________________________________
_______________________________________________
Python-bugs-list mailing list
Unsubscribe:
https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
