file_object = open('userdata.txt') userdatadic = { } log=0 erroruesr={} def login():     for line in file_object:          line = line.strip('\n')          userdatalist =line.split('---')          userdatadic[userdatalist[0]] =  userdatalist[1] #从数据库中调用信息     for i in range(3):         username=input("uesrname:")         FBItext = open('FBI.txt')         for line in FBItext:             line = line.strip('\n')             if line ==username:                 print("you're lose too many mistakes")                 return #判断是否黑名单         else:             password=input("password:")             for value in userdatadic.keys():                 if value==username:                     if userdatadic[value]==password:                         print("welcome")                         log = 1                         break #对比账号密码                     else:                         for v in erroruesr.keys():                             if v == username:                                 erroruesr[username] += 1                                 break                         else:                             erroruesr[username] = 1 #记录输出的信息             if log == 1:                 break     else:         for v in erroruesr.values():             if v>=3:                 f = open("FBI.txt", 'a')                 f.write(username+"\n")                 f.close()         print("you're lose too many mistakes") #对比输错信息，并保存 login()