If your input has no decimal point in it, eval (or input) will return an integer, not a float. Other than that, I can't see any obvious reason for there to be a difference. Can you put together a simple script that demonstrates the problem and post it, along with the exact input that you're giving it, and the different outputs?
Understood. I'm trying to learn Python by porting an ODE solver I wrote over from C#, so what I'll do is break down the routine and append a small code snippet highlighting the difference.
I know this is probably redundant but Python 2.7.3 is running on a Mac and 3.3.0 on a PC, so it's not exactly an apples-v-apples comparison.
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