Rock Paper S L S | Python Fiddle

import math
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

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 "Enter 0-4"

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 "enter 'rock', 'Spock', 'paper', 'lizard' or 'scissors'"

def rpsls(name): 
    # convert name to player_number using name_to_number
    player_number = name_to_number(raw_input("Choose Rock, Paper, Scissors, Lizard or Spock\n"))

# compute random guess for comp_number using random.randrange()
    comp_number = random.randrange(0,4)
    # compute difference of player_number and comp_number modulo five
    res = (comp_number-player_number)%5
    print "Player chooses " + number_to_name(player_number)
    print ""
    print "Computer chooses " + number_to_name(comp_number)
    print ""
    # use if/elif/else to determine winner
    if res == 1 or res == 2:
        print "Computer wins!"
        print ""
        print ""
    elif res == 3 or res == 4:
        print "Player wins!"
        print ""
        print ""
    else:
        print "Player and computer tie!"
        print ""
        print ""

rpsls("Spock")
rpsls("Rock")
rpsls("Paper")
rpsls("Lizard")
rpsls("Scissors")

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