I'm running Python 2.4 on Darwin 7.5 (Mac OS X 10.3.5).

os.path.pathsep should be returning '/', since that's what everything that 
works with paths (the rest of the path module, plus the file class, etc.) 
expects. and yet it returns ':'.

making this even stranger is the fact that repr(os.path) returns the path to 
posixpath.

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You are misunderstanding what os.path.pathsep is for.  It is the string 
that separates paths themselves, not parts of a path.  It's ':' because that 
is how you separate paths on Darwin and any UNIX platform (e.g., "/usr/
bin:/usr/local/bin".

And because Darwin is UNIX it uses posixpath.

Closing as invalid since the setting is right and is not even in the official 
docs so general usage is not supported.

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I wasn't suggesting that Darwin shouldn't use posixpath, I was wondering why it 
would be returning ':' for the path separator.

thanks for the explanation.