[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 116fd4af7370706d0d99ac7c70541ef965672d4e by Victor Stinner in branch 'master':
bpo-39674: Suggest to test with DeprecationWarning (GH-18552)
https://github.com/python/cpython/commit/116fd4af7370706d0d99ac7c70541ef965672d4e


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