[issue40536] Addition of a "list of available time zones" function to zoneinfo

[Paul Ganssle]

Change by Paul Ganssle <p.ganssle at gmail.com>:


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pull_requests: +19461
pull_request: https://github.com/python/cpython/pull/20158

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue40536>
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