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> BTW I think the next goal should be to reduce the cost of constructing
> a Fraction out of to plain ints by at least an order of magnitude. I
> believe this is possible.
I certainly hope so! Here's a very simple (and simplistic) benchmark:
# start benchmark
from fractions import Fraction
from cProfile import run
def test1():
 return sum(Fraction(1, n*n-1) for n in xrange(2, 100000))
run("test1()")
#end benchmark
On my MacBook this reports a total time of 38.072 seconds, with 22.731 of 
those (i.e. around 60%) being spent in abc.__instancecheck__ and its 
callees.