pydoc 

Documentation generator and online help system. 
doctest 

A framework for verifying examples in docstrings. 
unittest 

Unit testing framework for Python. 
math 

Mathematical functions (sin() etc.). 
cmath 

Mathematical functions for complex numbers. 
random 

Generate pseudorandom numbers with various common
distributions. 
whrandom 

Floating point pseudorandom number generator. 
bisect 

Array bisection algorithms for binary searching. 
array 

Efficient arrays of uniformly typed numeric values. 
ConfigParser 

Configuration file parser. 
fileinput 

Perllike iteration over lines from multiple input
streams, with ``save in place'' capability. 
xreadlines 

Efficient iteration over the lines of a file. 
calendar 

Functions for working with calendars,
including some emulation of the Unix cal
program. 
cmd 

Build lineoriented command interpreters. 
shlex 

Simple lexical analysis for Unix shelllike languages. 