>  I would like to know how would I evaluate a string expression in python.
>  For example, if i say:
> >>> a = "3*2"
>  I want to do something to evaluate the variable 'a' to give me 6. How
>  can I do this?
> 

I think the "eval" built-in function is what you're after:

> >> a = "3*2"
> >> eval(a)
6

http://docs.python.org/library/functions.html
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