> If the user must be able to enter in the function, then it would be
better
> to evaluate this once and turn it into some sort of function that
you can
> call inside the loop (it's the eval that is so expensive). How to
do that
> depends a lot on how complex the possible functions can be (if
they'll only
> include 'x*+/-' and numbers, for example, it's not so tricky).
exp = raw_input('Type expression')
func = eval('lambda x: " + exp)
print func(42)
etc...
Or if you really can't grokm lambda:
exec('def func(x): return " + exp)
should do the same...
Alan G.
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