Mini-project # 1

之前学过learn programming everybody，感觉水水的。。这门课看起来复杂一点。

python真是一门神奇的语言，喜欢

总体而言没什么难度，跟着他的提示走分分钟就可以搞定。。。

用模运算来判断胜负很机智。

突然想到当初北大校赛还是哪里的那道五行题。。。被自己蠢哭> <

注意一下range的范围是左闭右开的，evaluate peer 的时候发现了很多人范围写成(0, 4)了，这真是一个悲剧。。

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

def name_to_number(name):
    # delete the following pass statement and fill in your code below
    if "rock" == name:
        return 0;
    elif "Spock" == name :
        return 1;
    elif "paper" == name:
        return 2;
    elif "lizard" == name:
        return 3;
    elif "scissors" == name:
        return 4;
    else:
        print "wrong name"
        return -1;

    # convert name to number using if/elif/else
    # don't forget to return the result!


def number_to_name(number):
    # delete the following pass statement and fill in your code below
    if 0 == number:
        return "rock"
    elif 1 == number:
        return "Spock"
    elif 2 == number:
        return "paper"
    elif 3 == number:
        return "lizard"
    elif 4 == number:
        return "scissors"
    else :
        print "wrong number"
        return ""
    # convert number to a name using if/elif/else
    # don't forget to return the result!
    

def rpsls(player_choice): 
    # delete the following pass statement and fill in your code below
    
    # print a blank line to separate consecutive games
        print ""
    # 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, 5)
    # 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
        differ = (comp_number - player_number + 5) % 5
    # use if/elif/else to determine winner, print winner message
        if player_number == -1:
            print "error"
        elif differ == 0:
            print "Player and computer tie!"
        elif differ  <= 2:
            print "Computer wins!"
        else :
            print "Player wins!"
    
# test your code - THESE CALLS MUST BE PRESENT 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