dis(Disassembler for Python bytecode)
lxml, html/xml parser
paramiko, ssh
selenium, UI simulators
pycurl, cURL lib
[mechanize](Stateful programmatic web browsing),
ipdb, debugger
pymongo, python Mongo driver
PIL, graphs
matplotlib, drawing
mako, template library
numpy/scipy, Scientific python
Scrapy, web crawler
pyQuery, web crawler, using jQuery
SQLAlchemy, Object-relational mapping(ORM)
Gevent, using libev event loop
wxpython, GUI
dateutil, utilities for date time
GitPython, git
[Subprocess and Shell Commands in Python] (http://www.pythonforbeginners.com/os/subprocess-for-system-administrators)
[Example Google Style Python Docstrings] (http://sphinxcontrib-napoleon.readthedocs.org/en/latest/example_google.html)