The rpncalc package adds an interactive Reverse Polish Notation (RPN) interpreter to Python. This interpreter allows the use of Python as an RPN calculator. You can easily switch between the RPN interpreter and the standard Python interpreter.
Home page: http://calcrpnpy.sourceforge.net/
Changes in 1.2
* Added ratfun module that provides polynomial and rational function classes. These classes support mixed arithmetic where numbers, polynomials, and rational functions can be combined in a Python expression.
* Incorporate a syntax that allows entering polynomials and rational functions from the RPN interpreter.
--
http://mail.python.org/mailman/listinfo/python-list