Python Lex & Yacc http://www.dabeaz.com/ply/
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python-ply

PLY is a straightforward lex/yacc implementation. Here is a list of its essential features:

  • It is implemented entirely in Python.
  • It uses LR-parsing which is reasonably efficient and well suited for larger grammars.
  • PLY provides most of the standard lex/yacc features including support for empty productions, precedence rules, error recovery, and support for ambiguous grammars.
  • PLY is straightforward to use and provides very extensive error checking.
  • PLY doesn't try to do anything more or less than provide the basic lex/yacc functionality. In other words, it's not a large parsing framework or a component of some larger system..