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Wed Oct 1 19:14:00 CEST 2008 · https://mail.python.org/pipermail/python-dev/2008-October/082747.html

glyph at divmod.com wrote:

> > I'm actually sort of liking this idea.  A Pathname class, for
> > convenience
> > a subtype of String, but containing the underlying binary
> > representation
> >used by the OS.  Even non-unicode pathnames could be represented.
> 
> On the one hand, I agree with you - except for the part where it's a
> subtype of String, that doesn't work.  In case I haven't mentioned it
> enough times already:
> 
> http://twistedmatrix.com/documents/8.1.0/api/twisted.python.filepath.FilePath.html
> 
> On the other hand, we've all been on this merry-go-round before:
> 
>    http://www.python.org/dev/peps/pep-0355/
> 
> Note especially the rejection notice: "Subclassing from str is a
> particularly bad idea".

Yes, the only real justification for it is to not break existing code
(otherwise, calling str() is not that much of an ordeal).

> On the other hand, we've all been on this merry-go-round before:
> 
>    http://www.python.org/dev/peps/pep-0355/

The very existence of os.path seems a good argument that something like
this is useful.  Perhaps PEP 355 just went too far.

Bill

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[Python-Dev] [Python-3000] New proposition for Python3 bytes filename issue