[issue40752] Implement PurePath.__len__

[Rémi Lapeyre]

Rémi Lapeyre <remi.lapeyre at henki.fr> added the comment:

PurePath is not iterable but I would expect 

len(Path('/home/remi/src/cpython')) == 4


The fact the the path is stored as a string is an implementation detail, it seems leaky to get the length of the string here.

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nosy: +remi.lapeyre

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