My first "serious" program written in python

Recently I started learning programming in python. After learning the command "print" and writing my first program (it was, of course, "hello world") I decided to get on with something more difficult. The result was my first simple calculator in python. Very simple. It looks like this:

While True:
a = input(" ")
a = int(a)
b = input(" ")
b = int(b)
sum = a + b
subtraction = a - b
multiplication = a * b
divisibility = a / b

result = input(" ")

if result == "+":
    print(sum)

elif result == "-":
    print(subtraction)

elif result == "*":
    print(multiplication)

elif result == "/":
    print(divisibility)

elif result == "=":
    break

input("")

To my surprise, my program works. What was your first program written in python? What are your progress in programming?