I would say, though, that you should be careful in your implementation of
is_on_line, for floating point round-off errors. Try this at the command
prompt (Python 2.5.2, with __future__ division imported):
>>> 49 * (1/49) == 1
False
>>> 1 - 49 * (1/49)
1.1102230246251565e-016
I would suggest a slightly modified version of is_on_line:
class Line(object):
EPSILON = 1e-15
...
def is_on_line(self,(x,y)):
'Test if point represtented by an (x,y) tuple is on the line'
return abs(self. m * x + self.c - y) < Line.EPSILON
-- Paul
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