New submission from Lanfon <[email protected]>:
Demonstration (via python -m asyncio):
asyncio REPL 3.9.0 (default, Oct 18 2020, 00:21:26)
[Clang 11.0.0 (clang-1100.0.33.16)] on darwin
Use "await" directly instead of "asyncio.run()".
Type "help", "copyright", "credits" or "license" for more information.
>>> import asyncio
>>> from contextvars import ContextVar
>>> ctx = ContextVar('ctx')
>>> ctx.set(1)
<Token var=<ContextVar name='ctx' at 0x1021bbc70> at 0x1021bf800>
>>> ctx.get()
Traceback (most recent call last):
File
"/Users/lanfon/.pyenv/versions/3.9.0/lib/python3.9/concurrent/futures/_base.py",
line 440, in result
return self.__get_result()
File
"/Users/lanfon/.pyenv/versions/3.9.0/lib/python3.9/concurrent/futures/_base.py",
line 389, in __get_result
raise self._exception
File "/Users/lanfon/.pyenv/versions/3.9.0/lib/python3.9/asyncio/__main__.py",
line 34, in callback
coro = func()
File "<console>", line 1, in <module>
LookupError: <ContextVar name='ctx' at 0x1021bbc70>
>>> exit()
It also got problem inside the functions when the context is referenced in
global scope.
----------
components: asyncio
messages: 388199
nosy: asvetlov, lanfon72, yselivanov
priority: normal
severity: normal
status: open
title: contextvars does not work properly in asyncio REPL.
type: behavior
versions: Python 3.8, Python 3.9
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Python tracker <[email protected]>
<https://bugs.python.org/issue43419>
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