python背单词小程序

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！！")