[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:

PR 18552 adds a section to What's New In Python 3.9 to strongly advice to check for DeprecationWarning in your Python projects.

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<https://bugs.python.org/issue39674>
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