0221判断登录是否成功小程序

user_name = input("请输入你的用户名：")
user_passwd = input("请输入你的密码：")
f = open("user01","r+",encoding="utf-8")
f_bak = open("user01_record","a+",encoding="utf-8")
for line in f.readlines():
    if user_name and user_passwd in line:
        line = user_name and user_passwd
        f_bak.write("%s登录成功!\n"% line)
        print("登录成功！")
        break
    elif user_name or user_passwd not in line:
        line = user_name
        f_bak.write("%s登录失败!\n"% line)
    print("登录失败!")
    break
f.close()
f_bak.close()