5. Miscellaneous Services

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The modules described in this chapter provide miscellaneous services that are available in all Python versions. Here's an overview:

`pydoc`		Documentation generator and online help system.
`doctest`		A framework for verifying interactive Python examples.
`unittest`		Unit testing framework for Python.
`test`		Regression tests package containing the testing suite for Python.
`test.test_support`		Support for Python regression tests.
`decimal`		Implementation of the General Decimal Arithmetic Specification.
`math`		Mathematical functions (`sin()` etc.).
`cmath`		Mathematical functions for complex numbers.
`random`		Generate pseudo-random numbers with various common distributions.
`whrandom`		Floating point pseudo-random number generator.
`bisect`		Array bisection algorithms for binary searching.
`collections`		High-performance datatypes
`heapq`		Heap queue algorithm (a.k.a. priority queue).
`array`		Efficient arrays of uniformly typed numeric values.
`sets`		Implementation of sets of unique elements.
`itertools`		Functions creating iterators for efficient looping.
`ConfigParser`		Configuration file parser.
`fileinput`		Perl-like iteration over lines from multiple input streams, with ``save in place'' capability.
`calendar`		Functions for working with calendars, including some emulation of the Unix cal program.
`cmd`		Build line-oriented command interpreters.
`shlex`		Simple lexical analysis for Unix shell-like languages.

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