Beginner Help request: Calculator

[JinLee]

Hello,

I am just starting to get my feet wet with Python and would like to ask for some insight as to why this script goes directly to the "else" line.

The code is as follows:

# adding two numbers
def add(x, y):
    return x + y

#subtracting two numbers
def subtract(x, y):
    return x - y

#multiplies two numbers
def multiply(x, y):
    return x * y

#divide two numbers
def divide(x, y):
    return x / y

print("Select operation")
print("1.Add")
print("2.Subtract")
print("3.Multiply")
print("4.Divide")

#take input from 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 == '3':
    print(num1,"*",num2,"=", multiply(num1,num2))

elif choice == '4':
    print(num1,"/",num2,"=", divide(num1,num2))

else:
    print("Invalid input")

Cheers,
J