Python

a=10
b=20
srting='a+b'
print(eval(string))

import operator
ops = { "+": operator.add, "-": operator.sub } # etc.

print(ops["+"](1,1)) # prints 2

ops = {"+": (lambda x,y: x+y), "-": (lambda x,y: x-y)}

op = {'+': lambda x, y: x + y,
      '-': lambda x, y: x - y}
print(op['+'](1,2))

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