[docs] [issue31517] MainThread association logic is fragile

[Antoine Pitrou]

Antoine Pitrou added the comment:

> That said, I do agree with Tim that the status quo isn't broken per se: we renamed `thread` to `_thread` in Python 3 for a reason

This is not caused by `_thread` specifically, but any background thread created by C code that might invoke Python code.  The reproducer just uses the `_thread` module out of convenience.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue31517>
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