python自动化运维之路~DAY1

刚学python，有大神给指点指点的吗？

#!/usr/bin/env python#_*_coding:utf8_*_import getpass,syscount = 0match_info = False #用布尔值来标志用户密码是否匹配，默认是flasewhile count < 3:    username = input("\033[32;1mAsk you for a username ：\033[0m")    with open("locked.txt",‘r‘,encoding="utf-8") as lock_check:        for lock in lock_check.readlines():            lock = lock.split()            type (username)            type (lock)            if username == lock[0]:                sys.exit(‘\033[31;1mSorry, the current user has been locked, please contact the administrator!\033[0m‘)    password = input(‘\033[32;1mAsk you for a password :\033[0m‘)    #password = getpass.getpass(‘\033[32;1mAsk you for a password :\033[0m‘)    with  open("user_info.txt",‘r‘,encoding="utf-8") as user_check:        for line in user_check.readlines():             user,passwd = line.strip(‘\n‘).split()             if username == user and password == passwd:                match_info = True                print("You are welcome to use this system", username)                sys.exit()    if match_info == False:        print("The account information you entered is not valid. Please re-enter it and enter the three error to lock the user.")        count += 1    else:        print("You are welcome to use this system", username)else:    print("Sorry, the user you entered has been locked.")    f = open("locked.txt","a",encoding="utf-8")    f.write(username )    f.close()

运行这个代码之前，要在代码的目录下新建locked.txt和user_info.txt在能执行的哟~

怎么才能把换行符写上去啊~我试过了好多次，都无法将换行符加上去呢~在线等大神指点啊