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ark said...

Tim is right to be worried about extending the truncate-toward-negative-infinity rule to floating-point numbers. The reason is that if a%b always has the sign of a when a's and b's signs differ, then a%b can always be represented exactly as a floating-point number if a and b can be represented exactly--at least, in every floating-point representation system I've seen. If, however, a%b takes on the sign of b when the signs differ, there are values of a and b that can preclude a%b from being represented exactly.

Aug 25, 2010, 1:09:30 AM

Posted to Why Python's Integer Division Floors