[issue39674] Keep deprecated features in Python 3.9 to ease migration from Python 2.7, but remove in Python 3.10

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:


New changeset 20d56bd41b56023ce9fa3739c0c9aa8be8d48bfa by Markus Gerstel in branch '3.8':
bpo-39674: Fix collections ABC deprecation notice (GH-25281)
https://github.com/python/cpython/commit/20d56bd41b56023ce9fa3739c0c9aa8be8d48bfa


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