rock pap sci | Python Fiddle

import random

def get_user_input():
    # Asks the user for rock, paper, and scissors.
    user_weapon = raw_input("Please select your weapon: (R) for rock, (P) for paper, (S) for scissors, or (Q) to quit: ")
    # Turns it in to uppercase when the user's input is lowercase
    if user_weapon == "r":
        user_weapon = "R"
    elif user_weapon == "p":
        user_weapon = "P"
    elif user_weapon == "s":
        user_weapon = "S"
    elif user_weapon == "q":
        user_weapon = "Q"
    # Asks the user to enter again if none of the options is entered
    elif user_weapon != "R" and user_weapon != "P" and user_weapon != "S" and user_weapon != "Q":
        print "Error. Please enter again!"
        user_weapon = get_user_input()
    return user_weapon
    
def choose_weapon():
    # randomly chooses rock, paper or scissors for the computer
    com_no = random.randint(1, 3)
    if com_no == 1:
        computer_weapon = "R"
    elif com_no == 2:
        computer_weapon = "P"
    else:
        computer_weapon = "S"
    return computer_weapon

def determine_winner(user_weapon, computer_weapon):
    # Compares the user_weapon to the computer_weapon and determines the winner
    if user_weapon == computer_weapon:
        winner = "T"
    elif (user_weapon == "R" and computer_weapon == "P") or (user_weapon == "P" and computer_weapon == "S") or (user_weapon == "S" and computer_weapon == "R"):
        winner = "C"
    else:
        winner = "U"
    return winner

def weapon_to_str(weapon):
    if weapon == "R":
        return "Rock"
    elif weapon == "P":
        return "Paper"
    elif weapon == "S":
        return "Scissors"

def main():
    rock_count = 0
    paper_count = 0
    scissors_count = 0
    tie_count = 0
    com_count = 0
    user_count = 0
    print "Let's play Rock, Paper, Scissors!"
    user_weapon = get_user_input()
    while user_weapon != "Q":
        if user_weapon == "R":
            rock_count += 1
        elif user_weapon == "P":
            paper_count += 1
        else:
            scissors_count += 1
        computer_weapon = choose_weapon()
        winner = determine_winner(user_weapon, computer_weapon)
        user_str = weapon_to_str(user_weapon)
        com_str = weapon_to_str(computer_weapon)
        if winner == "T":
            winner_str = "It's a tie!"
            tie_count += 1
        elif winner == "C":
            winner_str = "The computer wins!"
            com_count += 1
        else:
            winner_str = "You win!"
            user_count += 1
        print "You have chosen", user_str, "and the computer chose", com_str, ".", winner_str
    if tie_count + com_count + user_count == 0:
        print "I'm sorry to see you go without playing!"
    else:
        print "I'm sorry to see you go! You've proven to be a worthy adversary."
        print "The number of rounds the computer has won:", com_count
        print "The number of rounds the user has won:", user_count
        print "The number of rounds that ended in a tie:", tie_count
        print "The number of times you selected Rock:", rock_count
        print "The number of times you selected Paper:", paper_count
        print "The number of times you selected Scissors:", scissors_count

main()

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