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()