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

[Łukasz Langa]

Łukasz Langa <lukasz at langa.pl> added the comment:

This goes into 3.9, but please settle on a final design long before October. Scratch that, please do it ideally before beta 2.

I'm downgrading from release blocker, exception handling can be discussed and changed after beta 1 as well.

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