Rock, Paper Scissors

#Some imports needed for the game
from random import randrange
import time

#Some constants
R = "ROCK"
P = "PAPER"
S = "SCISSORS"
P_SCORE = 0
C_SCORE = 0
NAME = ""

#This is the welcome message and sets the NAME constant
def welcome():
    print"Welcome to 'Rock, Paper or Scissors', the most basic game ever!"
    NAME = raw_input("What is your name? ")
    NAME = NAME.upper()
    print"Hello %s" % (NAME)
    return NAME

#This is where the player makes his/her choice
def player_choice():
    print"Please select your weapon!"
    print"[1] - Rock"
    print"[2] - Paper"
    print"[3] - Scissors"
    p_weapon = input("choice: ")

    if p_weapon is 1:
        print"You have selected 'Rock' as your weapon"
        print"Computer is now selecting their weapon"
    elif p_weapon is 2:
        print"You have selected 'Paper' as your weapon"
        print"Computer is now selecting their weapon"
    elif p_weapon is 3:
        print"You have selected 'Scissors' as your weapon"
        print"Computer is now selecting their weapon"
    else:
        print ("%d is not a valid option. Please select 1, 2 or 3.\n" % p_weapon)
        player_choice()
    return p_weapon

#The computer selects a random number from 1, 2 or 3 and waits 5 seconds
def computer_choice():
    c_weapon = randrange(1,4)
    time.sleep(5)
    print"OK, I've made my choice!"
    return c_weapon

#This is where the two options are compaired
def who_wins(p_weapon, c_weapon):
    winner = 0
    if p_weapon is 1 and c_weapon is 1:
        print "you chose %s | computer chose %s" % (R, R)
        print"It's a DRAW!\n"
        winner = 0

    elif p_weapon is 1 and c_weapon is 2:
        print "you chose %s | computer chose %s" % (R, P)
        winner = 2
    elif p_weapon is 1 and c_weapon is 3:
        print "you chose %s | computer chose %s" % (R, S)
        winner = 1
    elif p_weapon is 2 and c_weapon is 1:
        print "you chose %s | computer chose %s" % (P, R)
        winner = 1
    elif p_weapon is 2 and c_weapon is 2:
        print "you chose %s | computer chose %s" % (P, P)
        print"It's a draw!\n"
        winner = 0
    elif p_weapon is 2 and c_weapon is 3:
        print "you chose %s | computer chose %s" % (P, S)
        winner = 2
    elif p_weapon is 3 and c_weapon is 1:
        print "you chose %s | computer chose %s" % (S, R)
        winner = 2
    elif p_weapon is 3 and c_weapon is 2:
        print "you chose %s | computer chose %s" % (S, P)
        winner = 1
    elif p_weapon is 3 and c_weapon is 3:
        print "you chose %s | computer chose %s" % (S, S)
        print"It's a draw!\n"
        winner = 0
    return winner

#This is where the score is printed
def print_score():
    print"%s : %d || COMPUTER : %d" % (NAME, P_SCORE, C_SCORE)

#End of game message
def end_game():
    print"Thanks for playing, goodbye!"

NAME = welcome()

game_on = 1

while game_on is 1:
    p_weapon = player_choice()
    c_weapon = computer_choice()
    winner = who_wins(p_weapon, c_weapon)

    if winner is 1:
        P_SCORE = P_SCORE + 1
        print"Congratulations!"
        print_score()

    if winner is 2:
        C_SCORE = C_SCORE + 1
        print"Better luck next time!"
        print_score()

    if winner is 0:
        print"It's a draw!"
        print_score()

    print"Play again? "
    again = raw_input("Y/n: ")
    if again.lower() == "y":
        print"OK, lets go again!"
    elif again.lower() == "n":
        game_on = 0


end_game()