> I'm not super-confident about the implementation of the
> path-manipulation functions, and I would prefer to use the Python
> implementations of the path-manipulation (dirname and join) instead.
> If there are any suggestions in this regard, I'd appreciate them.

From an implementation standpoint, I would indeed prefer the path handling
functions to be written in Python.

From a principle standpoint, I'm not sure it's a good idea for os.symlink()
to be non-atomic (there's a small race condition between reading the target's
attributes and creating the actual symlink).

Also, since in general you always know whether you're making a link to a
directory or a file, I'm not sure auto-detection is really a plus (except
that it makes things more familiar for Unix developers).