A convenient re-export of the parser and lexer for version 3.x of Python.

See:

• http://www.python.org/doc/3.1/reference/index.html for an overview of the language.
• http://www.python.org/doc/3.1/reference/grammar.html for the full grammar.
• http://www.python.org/doc/3.1/reference/toplevel_components.html for a description of the various Python top-levels, which correspond to the parsers provided here.