Pure Python rational numbers module for 2.5

Question

Has anybody seen such a thing? Small self-sufficient modules are preferred.

Answer 1

SymPy is a symbolic maths library written entirely in Python and has full support for rational numbers. From the tutorial:

>>> from sympy import *
>>> a = Rational(1,2)

>>> a
1/2

>>> a*2
1

>>> Rational(2)**50/Rational(10)**50
1/88817841970012523233890533447265625

There is also GMP for Python (GMPY) which, while not pure Python, is probably more efficient.