[issue45975] Simplify some while-loops with walrus operator

[Nick Drozd]

Change by Nick Drozd <nicholasdrozd at gmail.com>:


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keywords: +patch
pull_requests: +29267
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/31083

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue45975>
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