[issue45975] Simplify some while-loops with walrus operator

[Raymond Hettinger]

Raymond Hettinger <raymond.hettinger at gmail.com> added the comment:

> As I mentioned in the PR, merging this can make future
> backports to 3.6 and 3.7 more complicated.

That's correct, but it is also true that we do very few of those and the likelihood of a conflict with one of these edits is low.

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