PEP on path module for standard library
cam.ac.uk at mh391.invalid
Thu Jul 21 23:36:51 CEST 2005
Reinhold Birkenfeld wrote:
> FYI: I modified the path module a bit so that it fits many of the suggestions
> from python-dev, and put the result in the Python CVS tree under
> Most prominent change is that it doesn't inherit from str/unicode anymore.
> I found this distinction important, because as a str subclass the Path object
> has many methods that don't make sense for it.
Having path descend from str/unicode is extremely useful since I can
then pass a path object to any function someone else wrote without
having to worry about whether they were checking for basestring. I think
there is a widely used pattern of accepting either a basestring or a
file-like object as a function argument, and using isinstance() to
figure out which it is.
What do you gain from removing these methods? A smaller dir()?
 Probably str in actuality.
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