Python : Calulator

 import math

def add(a, b):
    return a + b


def Sub(a, b):
    return a - b


def Mul(a, b):
    return a * b


def div(a, b):
    return a / b


print("Please select operation -\n" \
      "1. add \n" \
      "2. sub \n" \
      "3.mul \n" \
      "4. div")

Select = int(input("Select operation form list 1 2 3 4:"))

Number_1 = int(input("Enter First Number :"))
number_2 = int(input("Enter 2nd number:"))


if Select == 1:
    print(Number_1, number_2, add(Number_1, number_2))


if Select == 2:
    print(Number_1, number_2, Sub(Number_1, number_2))


if Select == 3:
    print(Number_1, number_2, Mul(Number_1, number_2))

if Select == 4:
    print(Number_1, number_2, div(Number_1, number_2))

else:
    print("Invalid Entry")