How is the python floor division operator implemented?

Question

I know how the // operator works, but what is going on behind the scenes?

What I really want to know: Is it subject to floating point precision errors even when operating exclusively on integers?

Answer 1

Python does not use floating point arithmetic when calculating a // b (for a, b integers). An implementation of the classical long division algorithm to calculate the quotient and remainder when dividing a and b.

The actual division for large integers is implemented in x_divrem() which is found in longobject.c.