Python点滴5文件读写举例生成测验试卷

　　几个小知识：（程序中使用到了）
　　random.shuffle() 函数 : 方法将序列的所有元素随机排序
　　radom.sample(a,n)函数：从序列a中随机抽取n个元素，并将n个元素生以list形式返回
　　.keys() 函数返回的是一个可迭代序列 不是列表，需要 list（X.keys()）才能得到列表
　　index()函数可用于查找列表中对应函数的索引值并输出
　　＂ABCD＂[i] 意思是：ABCD看成一个数组，在每次的循环中迭代，值分别是 ＂A＂、＂B＂、＂C＂、＂D＂import random capitals = {＂Alabama＂:＂Montgomery＂,＂Alaska＂:＂Juneau＂,＂Arizona＂:＂Phoenix＂,＂Arkansas＂:＂Little Rock＂,＂California＂:＂Sacramento＂,             ＂Colorado＂:＂Denver＂,＂Connectiuct＂:＂Hartford＂,＂Delaware＂:＂Dover＂,＂Florida＂:＂Tallahassee＂,＂Georgia＂:＂Atlanta＂,＂Hawaii＂:＂Honolulu＂,＂Idaho＂:＂Boise＂,＂Illinois＂:＂Springfield＂,             ＂Indiana＂:＂Indianapolis＂,＂Iowa＂:＂Des Moines＂,＂Kansas＂:＂Topeka＂,＂Kentucky＂:＂Frankfort＂,＂Louisiana＂:＂Baton Rouge＂,＂Maine＂:＂Augusta＂,＂Maryland＂:＂Annapolis＂,             ＂Massachusetts＂:＂Boston＂,＂Michigan＂:＂Lanslng＂,＂Minnesota＂:＂Saint Paul＂,＂Mississippi＂:＂Jackson＂,＂Missouri＂:＂Jefferson City＂,＂Montana＂:＂Helena＂,＂Nebraska＂:＂Lincoln＂,             ＂Nevada＂:＂Carson City＂,＂New Hampshire＂:＂Concord＂,＂New Jersey＂:＂Trenton＂,＂New Mexico＂:＂Santa Fe＂,＂New York＂:＂Albany＂,＂North Carolina＂:＂Raleigh＂,             ＂North Dakota＂:＂Bismarck＂,＂Ohio＂:＂Columbus＂,＂Oklahome＂:＂Oklahoma City＂,＂Oregon＂:＂Salem＂,＂Pennsylvania＂:＂Harrisburg＂,＂Rhode Island＂:＂Providence＂,             ＂South Crolina＂:＂Columbia＂,＂South Dakota＂:＂Pierre＂,＂Tennessee＂:＂Nashville＂,＂Texas＂:＂Austin＂,＂Utah＂:＂Salt Lake City＂,＂Vermont＂:＂Montpelier＂,             ＂Virginia＂:＂Richmond＂,＂Washington＂:＂Olympia＂,＂West Virginia＂:＂Charleston＂,＂Wisconsin＂:＂Madison＂,＂Wyoming＂:＂Cheyenne＂} for quizNum in range(35):      quizFile = open(＂capitalsquiz%s.txt＂ % (quizNum + 1),＂w＂)     answerKeyFile = open(＂capitalsquiz_answers%s.txt＂ % (quizNum + 1),＂w＂)      quizFile.write(＂Name:  Date:  Period:  ＂)     quizFile.write((＂ ＂ * 20) + ＂State Capitals Quiz (From %s)＂ % (quizNum + 1))     quizFile.write(＂  ＂)      states = list(capitals.key())     random.shuffle(states)     for questionNum in range(50):         correctAnswer = capitals(states[questionNum])         wrongAnswers = list(capitals.valuse())         del wrongAnswers[wrongAnswers.index(correctAnswer)]         wrongAnswers = random.sample(wrongAnswers,3)         answerOptions = wrongAnswers + [correctAnswer]         random.shuffle(answerOptions)          quizFile.write(＂%s. What is the capital of %s? ＂ %(questionNum + 1,states[questionNum]))         for i in range(4):             quizFile.write:             quizFile.write( ＂%s. %s ＂ %(＂ABCD＂[i],answerOptions[i]))         quizFile.write(＂ ＂)          answerKeyFile.write(＂%s. %s ＂ %(questionNum + 1,＂ABCD＂[answerOptions.index(correctAnswer)]))          quizfile.close()         answerKeyFile.close()