[Pythonmac-SIG] cross platform os.path.nornpath problem

[bill fancher]

On Wednesday, September 18, 2002, at 11:53 AM, Magladry, Stephen wrote:

> we are working on a cross platform game and I am running into a 
> "problem"
> with os.path.normpath. We have decided to use Unix style relative paths
> within our Python code. The system, written in c++,  is then 
> responsible for
> the conversion to a Mac specific path for file i/o. The problem is lies
> within some Python code. Here is a quick example.
>
>
> import os
> print os.path.normpath( "foo/goo/file.txt" )# a unix relative path
> (result) >>> :foo/goo/file.txt
>
> Well, of course! "/" are valid chars in a Mac file name, so the 
> operation
> worked as intended. I would have liked to have the result be 
> "file.txt".

I don't see why normpath would return that even with POSIX paths. (It 
doesn't with the "unix python" installed in 10.2.)

> there a way within Python 2.2.1 that I could do this with writing our 
> own
> special normalizer?

You should compose your paths with os.path.join:

 >>> import os
 >>> p = os.path.join('foo','goo','file.txt')
 >>> p
':foo:goo:file.txt'
 >>> os.path.normpath(p)
':foo:goo:file.txt'
 >>>

and decompose them with os.path.split. E.g. to get "file.txt":

os.path.split('foo:goo:file.txt')[-1]

HTH,

--
bill

>
>
> Thanks,
>
>
> Stephen Magladry
>
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