Introduction to Programming Using Python——第10章 笔记

10.3 Case Study: Lotto Numbers

LISTING 10.2 LottoNumbers.py

isCovered = 99 * [False] # 初始化一个列表
endOfInput = True #设定一个跳出loop的判定值

while endOfInput:

	s = input("Enter a line of numbers separated by space:\n")  #用户输入数字并以“空格”隔开
	item = s.split()
	lst = [eval(x) for x in item]  # 注意这种语法格式convert every string in item to number

	for number in lst:
		if number == 0:
			endOfInput = False
		else:
			isCovered[number -1] = True  #将与之对应的位置标记成"True"

allCovered = True  #初始化一个值,假设所有值都覆盖了
for i in range(99):
	if isCovered[i] == False: #如果有数没有覆盖，初始值设为F
		allCovered = False
		break

if allCovered:
	print("The tickets cover all numbers")
else:
	print("The tickets don't cover all numbers")	

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10.4 Case Study: Deck of Cards

从52张扑克牌中任意抽取4张。

deck = [x for x in range(52)]

初始化deck列表，并赋值0~51，代表52张牌。注意每个数字代表特定的扑克牌，后面会有解释为什么。（利用[ ]和for语句初始化列表），或

deck = list(range(52))

使用list()函数和range()函数初始化列表

数字 0~12   spades 黑桃，

数字 13~25   hearts 红心，

数字 26~38   diamands 方块，

数字 39~51   clubs 草花，

52张牌的号码对应52张扑克，例如： 牌号为 3 ，3 // 3 是 0 代表 Spades（黑桃）,3 % 13 是 3 代表4，所以牌号3代表黑桃4

LISTING 10.3 DeckOfCards.py

deck = [x for x in range(52)]

suits = ["Spades", "Hearts", "Diamonds", "Clubs"]
ranks = ["Ace", "2", "3", "4", "5", "6", "7", "8", "9", "10", "Jack", "Queen", "King"]

import random
random.shuffle(deck) #洗牌

for i in range(4):
	suit = suits[deck[i] // 13]
	rank = ranks[deck[i] % 13]
	print("Card number", deck[i], "is the", rank, "of", suit)

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10.5 Deck of Cards GUI

跳过

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10.6 Copying Lists

list2 = list1

并不是把list1的值拷贝给list2，原因看下图