[Python-Dev] Integer behaviour in Python 2.6.4

Sturla Molden sturla at molden.no
Mon Nov 2 05:21:06 CET 2009

Curt Hagenlocher skrev:
> Does that not happen on non-Windows platforms? 2**31 can't be
> represented as a 32-bit signed integer, so it's automatically promoted
> to a long.
Yes you are right.

I've now traced down the problem to an integer overflow in NumPy.

It seems to have this Pyrex code:

cdef long lo, hi, diff
diff = hi - lo - 1



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