rps.py

#The program should do the following:Prompt the user to select either Rock, Paper, or Scissors. Instruct the computer to randomly select either Rock, Paper, or Scissors. Compare the user's choice and the computer's choice. Determine a winner (the user or the computer). Inform the user who the winner is

from random import randint
from time import sleep
options = ["R", "P", "S"]
LOSS_MESSAGE = "You lost!"
WIN_MESSAGE = "You won!"
def decide_winner(user_choice, computer_choice):
    print "You selected: %s" % user_choice
    sleep(1)
    print "Computer selected: %s" % computer_choice
    sleep(1)
    user_choice_index=options.index(user_choice)
    computer_choice_index=options.index(computer_choice)
    if user_choice_index == computer_choice_index:
        print "It's a tie!"
    elif user_choice_index == 0 and computer_choice_index == 2:
        print WIN_MESSAGE
    elif user_choice_index==1 and computer_choice_index==0:
        print WIN_MESSAGE
    elif user_choice_index==2 and computer_choice_index==1:
        print WIN_MESSAGE
    elif user_choice_index>2:
        print "Invalid Option! Try Again!"
    else:
        print LOSS_MESSAGE

def play_RPS():
    print "Rock, Paper, or Scissors?"
    user_choice = raw_input("Select R for Rock, P for Paper, or S for Scissors: ")
    user_choice = user_choice.upper()
    sleep(1)
    computer_choice = options [randint(0, len(options) - 1)]
    decide_winner(user_choice, computer_choice)

play_RPS()