# Take input from the user 
select = input("Select operations form 1, 2, 3, 4 :")

number_1 = int(input("Enter first number: "))
number_2 = int(input("Enter second number: "))

if select == '1':
print(number_1, "+", number_2, "=",
add(number_1, number_2))

elif select == '2':
print(number_1, "-", number_2, "=",
subtract(number_1, number_2))

elif select == '3':
print(number_1, "*", number_2, "=",
multiply(number_1, number_2))

elif select == '4':
print(number_1, "/", number_2, "=",
divide(number_1, number_2))
else:
print("Invalid input")

输出 :

Please select operation -
1. Add
2. Subtract
3. Multiply
4. Divide
Select operations form 1, 2, 3, 4 : 1
Enter first number : 15
Enter second number : 14
15 + 14 = 29