>  I'm afraid that your question doesn't pass the basic "Have I Googled it?"
>  test. I stuck "evaluate a string expression in python" into Google and got:
> 
>  http://www.google.co.uk/#q=evaluate+a+string+expression+in+python
> 
That search turns up a useful tutorial by effbot:

http://effbot.org/zone/librarybook-core-eval.htm

It covers the basics of how to safely use eval if the data is coming
from an untrusted source. Might be worth a look depending on your use
case.
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