__peter__ at web.de
Sun Nov 9 10:53:32 CET 2003
Ben Allfree wrote:
> Written to normalize web server path names based on a virtual root. I
> propose that something equivalent to this be added to os.path
The purpose remains unclear to me. Maybe you could expand a little.
For now, I suppose you intend vnormpath() to always return subfolders of
> import os.path
> import copy
> def vnormpath(root,path):
> Normalize a path based on a virtual root.
> r = copy.deepcopy(root)
> p = copy.deepcopy(path)
Strings are "immutable", i. e. you can't change them once created. You
therefore need not (I'd rather say must not) copy them.
> if os.path.isabs(path):
> return root + path
This can give you funny paths on Windows like "C:/firstC:/second"; on Unix
you can get anywhere the supplier of *path* wants,
e. g. vnormpath("/home/peter", "/../ben") returns "/home/peter/../ben" which
is equivalent to "home/ben".
> while os.path.commonprefix([root,
> <> root:
> r = os.path.join(r,"junk")
> return os.path.normpath(os.path.join(r,p))
I tried to break that, too, but must admit I didn't succed so far :-)
By the way, most pythonistas favour != over <>.
> if __name__ == "__main__":
> print vnormpath("C:\\foo\\baz",
The above demo is probably a good start, but try to think of a few more
use/test cases. For example, should
vnormpath("/home/ben", "/home/ben/temp") return "/home/ben/home/ben/temp" or
rather "home/ben/temp"? Also, I would compare vnormpath()'s actual against
the expected result instead of just printing it out. For production quality
code, have a look at the unittest module.
Conclusion: For the moment, be satisfied if you can fix the bugs and your
function serves *your* needs well. If you want to share the results, put it
on a web site.
For your code to make it into the python library, you have to convince
people that *they* need it badly and I dare say that you may face some
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