[issue45975] Simplify some while-loops with walrus operator

[miss-islington]

miss-islington <mariatta.wijaya+miss-islington at gmail.com> added the comment:


New changeset cf7cb1a2bf40516dc571d1d90c12b632dcd9b8c8 by Miss Islington (bot) in branch '3.9':
bpo-45975: IDLE - Remove extraneous parens (GH-31107)
https://github.com/python/cpython/commit/cf7cb1a2bf40516dc571d1d90c12b632dcd9b8c8


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<https://bugs.python.org/issue45975>
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