[issue40160] documentation example of os.walk should be less destructive

[Raymond Hettinger]

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

The proposed replacement doesn't succeed in demonstrating why topdown=False is necessary.  Consider doing a rename instead of a deletion or print.

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nosy: +rhettinger

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue40160>
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