I've not used it before, but I suspect it's meant to be used in "freeze" type environments. In that situation, you really do want everything reachable, whether the script imported it or not. It doesn't take much to wind up importing much of the stdlib either. Try:
python -m modulefinder -m /path/to/os.py This is from Python 2.7, YMMV slightly in Py3. Skip -- https://mail.python.org/mailman/listinfo/python-list
