Elliptic Code

[Philip Smith]

Hi

Does anyone have/know of a python implementation of the elliptic curve 
factoring algorithm (lenstra) which is both:

simply and cleanly coded
functional

I'm aware of William Stein's code (from elementary number theory book) but I 
don't understand his coding style and the algorithm doesn't seem to work 
efficiently.

For that matter has anyone come across any useable math/number theory 
packages apart from nzmath or aladim?

Thanks

Phil