Have you ever seen code in Python default modules, let's take a look:
First, find out where are they with "locate" command:
hvn@lappy: / $ locate subprocess
/usr/lib/python2.7/subprocess.py
/usr/lib/python2.7/subprocess.pyc
we've locate subprocess module, which has a name specific enough. All python default module are in /usr/lib/python2.7/