[issue35723] Add "time zone index" cache to datetime objects

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:

Paul started a discussion on python-dev:
https://mail.python.org/pipermail/python-dev/2019-May/157337.html

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35723>
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