On 04/14/2016 12:03 AM, Michael Mysinger via Python-Dev wrote:
Brett Cannon writes:
After playing with and considering the 4 possibilities, anything where
__fspath__ can return bytes seems like insanity that flies in the face of
everything Python 3 is trying to accomplish. In particular, one RichPath
class might return bytes and another str, or even worse the same class might
sometimes return bytes and sometimes str. When will os.path.join blow up due
to mixing bytes and str and when will it work in those situations?
What are you asking here? Exactly where in os.join mixing bytes & str
the exception will occur, or will mixing bytes & str ever work?
The answer to the first is irrelevant (except for performance).
The answer to the second is always/never. Meaning allowing os.fspath()
and __fspath__ to return either bytes or str will never cause the
combination of bytes and str to work. Said another way: if you are
using os.path.join then all the pieces have be str or all the pieces
have to be bytes.
--
~Ethan~
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