>>> gridsize=10
>>> t=gridsize/5
>>> range(30)
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29]
>>> map(snap,range(30))
[0, 0, 2, 3, 4, 5, 6, 7, 8, 10, 10, 10, 12, 13, 14, 15, 16, 17, 18, 20, 20, 20, 22, 23, 24, 25, 26, 27, 28, 30]
>>> t=gridsize/3
>>> map(snap,range(30))
[0, 0, 0, 3, 4, 5, 6, 7, 10, 10, 10, 10, 10, 13, 14, 15, 16, 17, 20, 20, 20, 20, 20, 23, 24, 25, 26, 27, 30, 30]
>>>