Executing a string as python code

[Stephen Boulet]

Can someone tell me how to execute an arbitrary string as python code?

I'm trying to make a bunch of lists named list00, list01, ..., to list99 (I 
don't want to make a single list of lists, since list00 is actually already 
a list of lists), and I thought doing this as a string would be the easiest 
way.

I guess a dictionary with string keys and list values would be another way 
(maybe a better way).

Thanks.

-- Stephen