Sorry about the lack of clarity there.

I'm calling os.path.splitext("C:\blah.ext") and trackback is returning an AttributeError: 'list' object has no attribute 'rfind' from within the definition for splitext in the NTPath module.

That's only the specific usage that brought about the error - I'm getting it for all calls to rfind everywhere.

I will admit it's a very strange error - I did some searching around and nobody else is experiencing the bug, so clearly it's a problem with my particular installation of Python. I haven't used any third-party Python extensions, however, and everything seems like it's as vanilla as possible to me.