I have just released a new module that interfaces the Class Library for Numbers (CLN) to Python. The CLN library is a C++ library that provides rational and arbitrary precision floating point numbers in real and complex form. The clnum module exposes these types to Python and also provides arbitrary precision replacements for the standard math functions in real and complex forms.
For more information see http://calcrpnpy.sourceforge.net/clnum.html Ray Buvel -- http://mail.python.org/mailman/listinfo/python-list