flex/bison like module in Python?

[Jerry Sievers]

Dear Pythonists;

Curious if there exists in Python package(s) for use as lexer/parser
for implementation of language grammars?

Already using cmd.py from the standard distro for it's basic features
but wishing for much more advanced capability.  As such, I refer to
flex/bison because though complex they are general purpose and very
useful.

I am trying to avoid having to do the lexer/parser part in C if
possible.

Thanks.

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