[New-bugs-announce] [issue43766] Implement PEP 647 (User-Defined Type Guards) in typing.py

Ken Jin report at bugs.python.org
Wed Apr 7 10:27:50 EDT 2021

New submission from Ken Jin <kenjin4096 at gmail.com>:

PEP 647 was recently accepted by the SC:

I'd like to work on the implementation for typing.py and any required docs later on (unless someone is already working on it, then I hope you'd let me help too ;). Hopefully I can get it in before the 3.10 beta freeze.

typing_extensions will need a port too, though that is much less urgent at the moment.

components: Library (Lib)
messages: 390436
nosy: gvanrossum, kj
priority: normal
severity: normal
status: open
title: Implement PEP 647 (User-Defined Type Guards) in typing.py
versions: Python 3.10

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