Python Program to write Simple Calculator

def add(x, y):
   """This function adds two numbers"""
   return x + y
def subtract(x, y):
   """This function subtracts two numbers"""
   return x - y
def multiply(x, y):
   """This function multiplies two numbers"""
   return x * y
def divide(x, y):
   """This function divides two numbers"""
   return x / y
print("Select operation.")
print("1.Add")
print("2.Subtract")
print("3.Multiply")
print("4.Divide")
# Take input from the user 
choice = input("Enter choice(1/2/3/4): ")
num1 = int(input("Enter first number: "))
num2 = int(input("Enter second number: "))
if choice == '1':
   print(num1,"+",num2,"=", add(num1,num2))
elif choice == '2':
   print(num1,"-",num2,"=", subtract(num1,num2))
elif choice