8 The modules described in this chapter help you write software. For example, the
9 :mod:`pydoc` module takes a module and generates documentation based on the
10 module's contents. The :mod:`doctest` and :mod:`unittest` modules contains
11 frameworks for writing unit tests that automatically exercise code and verify
12 that the expected output is produced. :program:`2to3` can translate Python 2.x
13 source code into valid Python 3.x code.
15 The list of modules described in this chapter is: