fast sub list operations

[Just van Rossum]

Robin Becker wrote:

> I didn't actually choose the data structure. Actually in this case Just
> the points are the lists of points from your Path class in
> reportlab.graphics.shapes, but I guess you didn't choose the base
> representation for lists of points either :-)

Heh, exactly... I think it was the Polygon class that set the example.
It's been a pain ever since ;-)

Just