Open
Description
Feature or enhancement
I would like to add __enter__ and __exit__ methods to contextvars.Context such that these two are mostly equivalent:
contextvars.copy_context().run(do_something_interesting)and:
with contextvars.copy_context():
do_something_interesting()Pitch
This makes it possible to combine Context enter/exit with other context managers:
import contextlib
import contextvars
@contextlib.contextmanager
def foo():
with contextvars.copy_context():
set_some_context_vars()
yieldMy personal motivating interest is controlling ContextVar values in pytest fixtures. For example:
import contextvars
import pytest
import module_under_test
@pytest.fixture
def clean_slate():
with contextvars.copy_context():
module_under_test._internal_state_context_var.set(None)
yield
def test_foo(clean_slate):
assert not module_under_test.is_initialized()Previous discussion
https://stackoverflow.com/q/59264158