Python开发之【用户登录锁定】

用户登录验证，输入密码错误三次，锁定此用户。 将用户信息存入文件

文件内容格式如下：

{'username':'heilong','password':'','login_flag':True}
{'username':'dong','password':'','login_flag':True}
{'username':'bin','password':'','login_flag':False}
{'username':'dun','password':'','login_flag':False}
{'username':'ke','password':'','login_flag':False}

文件内容

 import os

 file_ismodify = False

 username_in = input("请输入用户名：")
 with open("login_lock", "r", encoding="utf-8") as read_file, \
         open("login_lock_new", "w", encoding="utf-8") as write_file:
     for line in read_file:
         if eval(line)["username"] == username_in:
             if eval(line)["login_flag"]:
                 print("您的账号被锁定，拒绝登录！")
                 break
             else:
                 count = 0
                 while count < 3:
                     password_in = input("请输入密码：")
                     if eval(line)["password"] == password_in:
                         print("登录成功！")
                         break
                     else:
                         if count != 2:
                             print("登录失败,您还有%s次机会" % (2 - count))
                         else:
                             print("三次输入用户名或密码错误，拒绝登录！")
                             write_file.write("{'username':'%s','password':'%s','login_flag':%s}\n"\
                                                   %(username_in,eval(line)["password"],True))
                             file_ismodify = True
                             break
                     count += 1
         else:
             write_file.write(line)

 if file_ismodify:
     os.rename("login_lock","login_lock.bak")
     os.rename("login_lock_new","login_lock")
     os.remove("login_lock.bak")
 else:
     os.remove("login_lock_new")

代码