Question

Usual method of applying mathematics to variables is

a * b

Is it able to calculate and manipulate two operands like this?

a = input('enter a value')
b = input('enter a value') 
op = raw_input('enter a operand')

Then how do i connect op and two variables a and b?
I know I can compare op to +, -, %, $ and then assign and compute….

But can i do something like a op b, how to tell compiler that op is an operator?

Answer 1

You can use the operator module and a dictionary:

import operator
ops = {
    "+": operator.add,
    "-": operator.sub,
    "*": operator.mul,
    "/": operator.div
}   
op_char = input('enter a operand')
op_func = ops[op_char]
result = op_func(a, b)