New submission from Jason Chen <chen...@gmail.com>:
import asyncio
from contextvars import *
var = ContextVar('VarTest', default=None)
def get_var(tag=None):
obj = var.get()
if obj is None:
obj = object()
var.set(obj)
print(f'{tag=}: get_var result is {obj=}')
return obj
async def get_var_object(tag):
return get_var(tag)
async def asyncio_main():
await asyncio.gather(*[get_var_object(id) for id in range(2)])
def test(get_var_before_run=False):
print(f'{get_var_before_run=}')
if get_var_before_run:
get_var()
asyncio.run(asyncio_main())
print()
if __name__ == '__main__':
test(get_var_before_run=False)
test(get_var_before_run=True)
---- Output:-------
tag=0: get_var result is obj=<object object at 0x7f194571d210>
tag=1: get_var result is obj=<object object at 0x7f194571d200>
get_var_before_run=True
tag=None: get_var result is obj=<object object at 0x7f194571d210>
tag=0: get_var result is obj=<object object at 0x7f194571d210>
tag=1: get_var result is obj=<object object at 0x7f194571d210>
--- my question: ------
-- all objects in get_var_before_run=True are same.
-- my expected result is all objects should be different, because the code runs
in different context.
----------
components: asyncio
messages: 376464
nosy: asvetlov, chenzep, yselivanov
priority: normal
severity: normal
status: open
title: ContextVar get value is unexpected
versions: Python 3.8
_______________________________________
Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue41733>
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