See http://gmpy.sourceforge.net/ for details. What is it: a wrapper for the GMP 4 library (http://swox.com/gmp/), to provide multi-precision arithmetic for Python. Multi-precision floats, and unbounded-precision rationals, are not present in stock Python; multi-precision integers ('long') are, but gmpy's version of multi-precision integers is faster for some operations, and provides lots of nifty pre-packaged additional functions. Minor changes and bug-fixes since the latest 1.0 alpha: support for the latest versions of GMP and Python, particularly on the Mac (whose gmp 4 is pickier...). Windows binary releases are now installer-exe's, support Python 2.3 and 2.4, and (thanks to enhancements in the underlying GMP) are faster than the previous Windows binary releases of gmpy (so is the source release, on any platform, if you build it with the latest and greatest GMP). This release has no known bugs (the scan0/scan1 bug that used to be present in Windows binary releases, as predicted, has disappeared without needing any changes to gmpy, thanks to bug fixes in GMP; the divm function's bugs, that were gmpy's responsibility, are now fixed). Alex