RockPaperScissors.py

"""
This is a game of Rock, Paper, Scissors against the computer!
"""

from random import randint
from time import sleep

options = ["R", "P", "S"]

LOSE_MESSAGE = "Sorry, better luck next time!\n"
WIN_MESSAGE = "You won, nice work!\n"

def decide_winner(user_choice, computer_choice):
  print "\nYou chose %s.\n" % user_choice
  print "Computer selecting..."
  sleep(1)
  print "The computer chose %s.\n" % computer_choice
  user_choice_index = options.index(user_choice)
  computer_choice_index = options.index(computer_choice)
  if user_choice == computer_choice:
    print "You tied!\n"
  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 choice.\n"
    return
  else:
    print LOSE_MESSAGE

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