Rock-paper-scissors-lizard-Spock in Python

Rock-paper-scissors is a hand game that is played by two people. The players count to three in unison and simultaneously “throw” one of three hand signals that correspond to rock, paper or scissors. The winner is determined by the rules:

• Rock smashes scissors
• Scissors cuts paper
• Paper covers rock

Rock-paper-scissors is a surprisingly popular game that many people play seriously (see the Wikipedia article for details). Due to the fact that a tie happens around 1/3 of the time, several variants of Rock-Paper-Scissors exist that include more choices to make ties less likely.

Rock-paper-scissors-lizard-Spock (RPSLS) is a variant of Rock-paper-scissors that allows five choices. Each choice wins against two other choices, loses against two other choices and ties against itself. Much of RPSLS’s popularity is that it has been featured in 3 episodes of the TV series “The Big Bang Theory”. The Wikipedia entry for RPSLS gives the complete description of the details of the game.

# Rock-paper-scissors-lizard-Spock 

import random

# The key idea of this program is to equate the strings
# "rock", "paper", "scissors", "lizard", "Spock" to numbers
# as follows:
#
# 0 - rock
# 1 - Spock
# 2 - paper
# 3 - lizard
# 4 - scissors

# helper functions

# convert name to number using if/elif/else
def name_to_number(name):
    if(name == 'rock'):
        return 0;
    elif(name == 'Spock'):
        return 1;
    elif(name == 'paper'):
        return 2;
    elif(name == 'lizard'):
        return 3;
    elif(name == 'scissors'):
        return 4;
    else:
        print "ERROR Name"
# convert number to a name using if/elif/else
def number_to_name(number):
    
    if(number == 0):
        return 'rock';
    elif(number == 1):
        return 'Spock';
    elif(number == 2):
        return 'paper';
    elif(number == 3):
        return 'lizard';
    elif(number == 4):
        return 'scissors';
    else:
        print "ERROR Number"
def rpsls(player_choice): 

    
    # print a blank line to separate consecutive games
    print "\n"
    
    # print out the message for the player's choice
    print "Player chooses " + player_choice
    
    # convert the player's choice to player_number using the function name_to_number()
    player_number = name_to_number( player_choice )
    
    # compute random guess for comp_number using random.randrange()
    comp_number = random.randrange( 0, 4 )
    
    # convert comp_number to comp_choice using the function number_to_name()
    comp_choice = number_to_name( comp_number );
    
    # print out the message for computer's choice
    print "Computer chooses " + comp_choice
    
    # compute difference of comp_number and player_number modulo five
    difference = (comp_number - player_number) % 5
    
    # use if/elif/else to determine winner, print winner message
    if( difference == 1 or difference == 2 ):
        print "Computer wins!"
    elif ( difference == 4 or difference == 3 ):
        print "Player wins!"
    elif( difference == 0 ):
        print "Player and computer tie!"
        
           
# test your code - LEAVE THESE CALLS IN YOUR SUBMITTED CODE
rpsls("rock")
rpsls("Spock")
rpsls("paper")
rpsls("lizard")
rpsls("scissors")

# always remember to check your completed program against the grading rubric