Really great Python code
mace: The Python standard has some pure Python modules may be worth looking at.  Doug Hellmann's Python Module of the Week, http://www.doughellmann.com/PyMOTW/contents.html, is good place to start.I'd recommend looking at code that interests you.  It will make reading the code more interesting and perhaps more useful.  Here are some popular projects arrange by interest:  Web framework: Django, Pylons
  TCP/IP networking: the official Bittorrent client, Mercurial, Tornado
  Database: SQLAlchemy, SQLObject

Past HN submissions are generally a good place to find interesting projects too: http://searchyc.com/submissions/python?sort=by_points