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Update to Python 3.9

Description

Update to Python 3.9

So far we just use the walrus operator in a handful of places. TypedDict
might be useful later, but I can’t be bothered to check where it could
be useful for us right now.

This also fixes three places that still tried to read the
READ_ONLY_REASON using the lowercase key (changed in 1d17bc8e87).

Details

Provenance
LucasWerkmeisterAuthored on Sep 14 2021, 9:29 PM
LucasWerkmeisterPushed on Sep 14 2021, 10:28 PM
Parents
R2494:6d375c7dcca6: Add link to edit groups
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