regex - Replace string value in regular expression with integer value in python -

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this question has answer here:

in python code, user enters mathematical expression. want replace variables integer values , calculate result. can user regular expression in python replace variables integer values cant calculate sum replaced string of type string. can in tcl. has built in expr command pass string , automatically converts mathematical expression , calculates result. there way same in python?

thank you

yes there eval. example:

a=3 b=4 s="(a*a+b*b)**.5" eval(s)

but warned maybe security risk. may better use sympy http://sympy.org/en/index.html


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