[issue22570] Better stdlib support for Path objects

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

`str(object)` is not a protocol for getting a string out of an object. It's a protocol for getting a string for print(). __str__ is defined for every object and therefore is useless for getting a string out of "string-like" object (as __float__ for floats and __bytes__ for bytes). Perhaps we need a new special method __string__ that relates to __str__ as __index__ to __int__.

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nosy: +serhiy.storchaka

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<http://bugs.python.org/issue22570>
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