[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:

Andrew Bartlett of the Samba project asked to revert the removal of the "U" mode:
https://bugs.python.org/issue37330#msg362362

We should consider to revert the removal, and only remove the "U" mode in Python 3.10.

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