python简单用户管理模拟

编辑一个脚本，简单模拟用户管理系统，使得其具有以下功能：

• 注册：若用户存在，直接报错”name 已经存在”,若用户不存在，将用户信息保存起来，显示”注册成功”；
• 登陆:若用户存在，判断密码是否正确，判断正确后输出”登陆成功”。若用户不存在，报错”name 不存在”;
• 注销：用户存在，验证密码，确认后删除用户信息；若不存在，报错”name 不存在”；
• 退出；

该脚本如下所示：

Account = {}def User_Exist(username):    if username in Account:        return True    else:        return Falsedef Passwd_right(username, password):    if password == Account.get(username):        return True    else:        return Falsedef Create():    while True:        print "Please input username and password what you want to create !"        New_user = raw_input("Username : ")        if User_Exist(New_user):            print "user is exist ! please input again !"        else:            break        print "\n"    New_password = raw_input("Password :")    Account.setdefault(New_user, New_password)    return "Account was created successfully !"def Login():    a = 0    while a < 3:        print "Please input your username and password !"        Username = raw_input("Username : ")        Password = raw_input("Password : ")        if User_Exist(Username):            if Passwd_right(Username, Password):                return "Login successfully !"            else:                print "Your username or password wrong !"        else:            print "This username is not exist !"        a += 1        print "\n"    else:        return "The number of faults is bigger than 3 !"def Close():    a = 0    while a < 3:        print "Please input username and password what you want to close !"        Close_username = raw_input("Username : ")        Close_password = raw_input("Password : ")        if User_Exist(Close_username):            if Passwd_right(Close_username, Close_password):                Right = raw_input("Do you really want to close user this account ?(Y/N) ")                if Right in "Yy":                    Account.pop(Close_username)                    return "Your account close successfully"                elif Right in "Nn":                    return "Select None !"                else:                    print "Please input Y or N !"                    print "\n"            else:                print "Your username or password wrong !"                print "\n"        else:            print "This username is not exist !"            print "\n"        a += 1    else:        return "The number of faults is bigger than 3 !"def Quit():    print "Goodbye !"    print "\n"    return exit(0)Select_dict = {    "1": Create,    "2": Login,    "3": Close,    "4": Quit}while True:    print "\n"    print """                        welcome to xxx system    There is some function you can select :                1. Create Account                2. Login                3. Close the Account                4. Quit"""    Select = raw_input("Please input your select (1,2,3,4) :").strip()    if Select in Select_dict.keys():        print Select_dict[Select]()    else:        print "Please input right select (1,2,3,4) !"

该脚本运行后的效果图如下图所示：
用户注册的效果图：

注册时可以看出，当注册成功后，显示用户创建成功。当用户存在时，显示用户已存在。

登陆时的效果图：

由登陆效果图可以看出，当用户登录时，用户不存在，显示用户不存在。当用户密码错误时，显示用户账号或密码错误。当错误次数超过三次时，显示失败的次数超过三次，然后退出登陆界面。当用户输入正确的账号密码时，显示登陆成功。

用户注销的效果图：

注销用户时，输入用户的账号和密码，选择是否确定删除这个用户，确认后删除这个用户，提示用户删除成功。

退出的效果图，选择后直接退出系统：