Python: OverflowError: math range error

Question

I get a Overflow error when i try this calculation, but i cant figure out why.

1-math.exp(-4*1000000*-0.0641515994108)

Answer 1

This may give you a clue why:

http://www.wolframalpha.com/input/?i=math.exp%28-4*1000000*-0.0641515994108%29

Notice the 111442 exponent.