How about adding rational fraction to Python?

[Paul Rubin]

Carl Banks <pavlovevidence at gmail.com> writes:
> Try doing numerical integration sometime with rationals, and tell me
> how that works out.  Try calculating compound interest and storing
> results for 1000 customers every month, and compare the size of your
> database before and after.

Usually you would round to the nearest penny before storing in the
database.