rps.py

import random
def userChoice():
    """ Asks user for choice of input. If input is correct, Returns choice ."""
    userChoice = raw_input("Do you choose rock, paper or scissors?").lower()

    while userChoice != "rock"\
        and userChoice != "paper"\
        and userChoice != "scissors":
        userChoice = raw_input("Do you choose rock, paper or scissors?").lower()

    return userChoice;


def computerChoice():
    """ Randomly generates the computers choice."""
    computerChoice = random.randrange(0, 3)
    if computerChoice == 0:
        computerChoice = "rock"
    elif computerChoice == 1:
        computerChoice = "paper"
    else:
        computerChoice = "scissors"
    print "computers choice =",computerChoice
    return computerChoice


def compare(choice1, choice2):
    """ Takes two choices as parameters and compares them.
        A result is returned in the form of "a tie!" or the winning choice."""

    if choice1 == choice2:

        return "The result is a tie!"

    if choice1 == "rock":
        if choice2 == "scissors":
            return "rock wins";
        else:
            return "paper wins";


    if choice1 == "paper":
        if choice2 == "rock":
            return "paper wins"
        else:
            return "scissors wins"



    if choice1 == "scissors":
        if choice2 == "rock":
            return "rock wins ";
        else:
            return "scissors wins";

# start the program by calling compare, passing userChoice and computerChoice functions as parameters.
print compare(userChoice(), computerChoice())