import random as t#创建单词序列words=("easy","difficult","answer","continue")zi=("容易","困难","回答","继续")hanzi={ "easy":"容易", "difficult":"困难","answer":"回答", "continue":"继续","blue":"蓝色"}yin={"容易":"easy","困难":"difficult","回答":"answer","继续":"continue","蓝色":"blue"}def jiemian():    print("""                     欢迎来到背单词        根据English回答汉语或者根据汉语回答English        -------------------------------------------                    1.English——>汉语                                        2.汉语——>English                                        3.单词列表                                        4.退出系统""")#######Zhang######  English——>汉语   ################################    def yyihan():     n=0    m=0    su=0    iscontinue="y"    while iscontinue=="y" or iscontinue=="Y":        word=t.choice(words)        print("随机生成在单词:")        print(">------>   "+word)        guess=input("\n输入汉语: ").strip()# 防止用户误操作录入空白        while guess!=hanzi[word]:            print("对不起，不正确。")            n=n+1            print('\n——>正确率：%.2f'%(m/(n+m)))            guess=input("继续输入：").strip()        if guess==hanzi[word]:             print("真棒！答对了！！")             m=m+1             print('\n——>正确率：%.2f'%(m/(n+m)))        iscontinue=input("\nn\是否继续（Y/N）：")        ###############  汉语——>English   #########wei####################
def hanyiy():    n=0;    m=0;    su=0;    iscontinue="y"    while iscontinue=="y" or iscontinue=="Y":        hz=t.choice(zi)        print("随机生成在汉语:")        print(">------>   "+hz)        guess=input("\n输入Ehglish: ").strip()        while guess!=yin[hz]:            print("对不起，不正确。")            n=n+1            print('\n——>正确率：%.2f'%(m/(n+m)))            guess=input("继续输入：").strip()        if guess==yin[hz]:            print("真棒！答对了！！")            m=m+1            print('\n——>正确率：%.2f'%(m/(n+m)))        iscontinue=input("\nn\是否继续（Y/N）：")
####bu##########################################################
def lib():    print("************************")    print("\n")    for i in range (len(words)):        print(words[i],"   ",zi[i],"\n")    print("\n")    print("************************")    a=input("输入 1 背诵单词结束——>: ")

###################################################################        while True:    jiemian()    a=int(input("\n\n\n\选择需要进行的操作（1、2、3、4）："))    if(a==1):        yyihan()    elif a==2:        hanyiy()    elif a==3:        lib()    elif a==4:        exit()    else:        print("输入格式错误，重新输入！！")