Integer math question

[Sean Ross]

Here's an interactive Python example to help clarify the previous response:

>>> a = 5
>>> b = 10
>>> q , r = divmod(a,b)
>>> q
0
>>> r
5
>>> a = -a
>>> a
-5
>>> q , r = divmod(a,b)
>>> q
-1
>>> r
5
>>> b*q + r    # division algorithm
-5
>>> -5 == a
True
>>>