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

[Paul Ganssle]

Paul Ganssle <p.ganssle at gmail.com> added the comment:

I've merged the existing implementation, but I'm leaving this staged as "release blocker" so that Łukasz can have final say on whether this goes into 3.9.

Thanks for the help everyone!

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<https://bugs.python.org/issue40536>
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