Raymond Hettinger <raymond.hettin...@gmail.com> added the comment:

One possibility is a gathering cumulative directory statistics that include 
totals from all descendants (i.e. how many bytes of files would you save by 
removing the directory with rm -rf).

Outside of aggregating statistics, the normal reason to use topdown=False is 
when paths are being mutated.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue40160>
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