>>> from rectangles import rect_number
>>> lrect =  [((1, 1), (4, 8)), ((1, 3), (4, 8)), ((0, 0), (3, 4))]
>>> rect_number ((2, 2), lrect)
2
>>> rect_number ((-2, -2), lrect)
0
>>> rect_number ((0, 1), lrect)
1