How do I convert a string to math in python?

So I want to convert a string to a math in python but am getting this error

string = "2 + 5"
math = int(string)
print(math)
>>> Should output 7 but instead outputs an error

How do I do it?

>Solution :

Instead of int() use eval():

string = "2 + 5"
math = eval(string)
print(math)

Or simply:

string = "2 + 5"
print(eval(string))