[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 91fe4142642286b65c166f7b6e27de16f42b1286 by Victor Stinner in branch 'master':
bpo-39674: Update collections ABC deprecation doc (GH-18747)
https://github.com/python/cpython/commit/91fe4142642286b65c166f7b6e27de16f42b1286


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