Not scoping, typing.
When you do i+1, this is preparsed into
sage: preparse('[len(top_points(i+1)) for i in range(2,10)]')
'[len(top_points(i+Integer(1))) for i in range(Integer(2),Integer(10))]'
and the addition means that top_points is passed not a Python int, but a
Sage Integer, and your divisions aren't Python 2 truncating division.
To avoid this, you could use srange:
sage: [len(top_points(i)) for i in range(3,11)]
[5, 5, 5, 5, 5, 5, 5, 5]
sage: [len(top_points(i)) for i in srange(3,11)]
[30, 55, 91, 140, 204, 285, 385, 506]
or the `..` notation:
sage: [len(top_points(i)) for i in (3..10)]
[30, 55, 91, 140, 204, 285, 385, 506]
or anything which makes sure that you're not dividing an int by an int.
Doug
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