Pyparsing is a general parsing module for Python. Grammars are implemented
directly in the client code using parsing objects, instead of externally, as
with lex/yacc-type tools. Includes simple examples for parsing SQL, CORBA IDL,
and 4-function math.

WWW: https://pypi.org/project/pyparsing/
WWW: http://pyparsing.wikispaces.com/