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

[Roundup Robot]

Change by Roundup Robot <devnull at psf.upfronthosting.co.za>:


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nosy: +python-dev
nosy_count: 5.0 -> 6.0
pull_requests: +24016
pull_request: https://github.com/python/cpython/pull/25280

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39674>
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