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

[John Taylor]

John Taylor <johntaylor at gmail.com> added the comment:

I would prefer an example that does not actually modify the file system.  Is there any way this could be achieved, yet still demonstrate why topdown=False is necessary?

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