flag = True
while flag:
    user = input(‘please input your username:‘)
    locked = open(‘locked‘, ‘r+‘, encoding=‘utf8‘)
    for line1 in locked:
        if user.strip() != line1:
            f = open(‘账户信息‘, encoding=‘utf8‘)
            for line in f:
                list=line.split(‘---‘)
                username=list[0]
                passwd=list[1]
                if username.strip() == user.strip():
                    count = 0
                    while count < 3:
                        psd = input(‘please input your password:‘)
                        if passwd.strip() ==  psd.strip():
                            print(‘welcome !‘)
                            flag  = False
                            break
                        else:
                            print(‘passwd error‘)
                            count += 1
                    if count == 3:
                        print(‘输错3次，用户已锁定‘)

                        locked.write(user.strip())
                        locked.close()
                        flag = False
                        break
        else:
            print(‘用户已锁定‘)