python class __getitem__ negative index handling

Question

Is there a common function to do this? Right now I'm just doing the following (and overriding __len__)

idx < 0:
    idx = len(self) + idx
if idx < 0 or idx >= len(self):
    raise IndexError, "array index (%d) out of range [0, %d)" %(idx, len(self))

Answer 1

That seems fine to me. I don't think there is a better or built-in way to do that; overriding is about providing your own functionality, after all.

Edited to remove rather stupid suggestion.