pythontidy reads Python code from standard input and writes a revised
version to standard output.  Alternatively, it may be invoked with file
names as arguments.

It means to encapsulate the wisdom revealed in:

Rossum, Guido van, and Barry Warsaw. "PEP 8: Style Guide for Python Code."
23 Mar. 2006. Python.org. 28 Nov. 2006
<http://www.python.org/dev/peps/pep-0008/>.