Week_1_RPSLS.py

# Rock-paper-scissors-lizard-Spock template


# 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

import random

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:
        return "invalid"

    
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:
        return -1

def rpsls(name): 
    player_number = name_to_number(name)
    comp_number = random.randrange(0,5)
    comp_name = number_to_name(comp_number)
    print 'Player chooses', name
    print 'Computer chooses', comp_name
    if 1<=(player_number - comp_number) % 5<=2:
        print 'Player wins!'
    elif (player_number - comp_number) % 5 >2:
        print 'Computer wins!'
    else:
        print 'Player and computer tie!'
    print 

    
# test your code
rpsls("rock")
rpsls("Spock")
rpsls("paper")
rpsls("lizard")
rpsls("scissors")