[New-bugs-announce] [issue42815] new thread doesn't copy context of the parent thread

[Yurii Karabas]

New submission from Yurii Karabas <1998uriyyo at gmail.com>:

New thread doesn't copy context of the parent thread.

The minimal example to reproduce the issue:
```
from threading import Thread
from contextvars import ContextVar

foo: ContextVar[str] = ContextVar("foo")


def temp():
    print(foo.get())


foo.set("bar")

t = Thread(target=temp)
t.start()
t.join()
```

Is it expected behavior?

PEP 567 I didn't find anything regarding this case.

----------
components: Library (Lib)
messages: 384262
nosy: uriyyo
priority: normal
severity: normal
status: open
title: new thread doesn't copy context of the parent thread
type: behavior
versions: Python 3.10

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue42815>
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