The documentation for os.path.normcase(path) is currently confusing or self-contradictory.

Currently, it reads--

"Normalize the case of a pathname. On Unix and Mac OS X, this returns the path unchanged; on case-insensitive filesystems, it converts the path to lowercase."

However, with a case-insensitive file system on Mac OS X (e.g. "File System Personality: Journaled HFS+"), normcase() does not convert paths to lowercase.

As it stands, it seems like the clause "on case-insensitive filesystems, it converts the path to lowercase" should be removed or further qualified.  I don't know what the qualification is though.