python小练习之二

---

title: python小练习之二

tags: 新建,模板,小书匠

grammar_cjkRuby: true

python小练习之二

需求:实现用户登录,用户名和密码保存到文件里,连续输入三次密码错误,则退出

在需求上,略拓展了那么一丢丢:实现用户注册,用户名不存在则引导用户注册,用户注册时检测是否有用户名重复的情况

尚未实现的:检测用户是否存在的时候,没有实现用户名的精确匹配,比如,用户名aa和用户名aaa,如果aaa用户名注册过了,会认为aa用户也注册过了,这块需要修改

# coding:utf-8

class User(object):
    def __init__(self):
        self.userchoice = 0
        self.userlist = list()
        self.username = str()
        self.password = str()
        # 用户名是否被使用了
        self.nameused = 0
        # 用户的用户名+密码是否能匹配
        self.user_correct = 0
        # 用户是否存在
        self.user_exist = 0
        # 用户登录尝试次数
        self.login_try_count = 0
        # 用户登录允许最大尝试次数为3次
        self.login_limit_count = 3

    def GenUserList(self):
        self.userlist = list()
        with open("userlist", "a+") as fd_userlist:
            for line in fd_userlist:
                if line.rstrip("\n"):
                    self.userlist.append(line.rstrip("\n"))

    def WriteUserList(self, username):
        username = self.username
        with open("userlist", "a+") as fd_userlist:
            fd_userlist.write(self.username)
            fd_userlist.write("\n")

    def UsernameCheck(self, username):
        self.GenUserList()
        self.nameused = 0
        username = self.username
        if self.username in self.userlist:
            print '%s 用户名已经使用过了,请重新选择用户名' %(self.username)
            self.nameused = 1
        elif self.UserExist(self.username) == 1:
            self.nameused = 0
        return self.nameused

    def UserExist(self, username):
        with open("userprofile", "a+") as fd:
            for line in fd:
                if line.find(username) == 0:
                    self.user_exist = 1
                    return self.user_exist
                else:
                    self.user_exist = 0
                    return self.user_exist

    def UserRegister(self):
        input_username = raw_input("请输入用户名:")
        self.username = input_username.strip()
        if self.UsernameCheck(self.username) == 0:
            input_password = raw_input('请输入密码:').strip()
            self.password = input_password
            with open('userprofile', 'a+') as fd_userprofile:
                 # fd_userprofile.write('username:' + self.username + '|')
                 # fd_userprofile.write('password:' + self.password)
                 fd_userprofile.write(self.username + '|')
                 fd_userprofile.write(self.password)
                 fd_userprofile.write("\n")
                 self.WriteUserList(self.username)
        else:
            self.UserRegister()

    def UserCorrect(self, username, password):
        userProfile_dict_list = list()
        with open("userprofile", "a+") as fd:
            for line in fd:
                u, temp_p = line.split("|")
                p = temp_p.strip()
                userProfile_dict_list.append({'username': u, 'password':
                            p})
        length = len(userProfile_dict_list)
        for i in xrange(length):
            if username == userProfile_dict_list[i]['username']:
                if password == userProfile_dict_list[i]['password']:
                    self.user_correct = 1
                    return self.user_correct
                else:
                    self.user_correct = 0
                    return self.user_correct
            # return self.user_correct

    def UserLogin(self):
        userProfile_dict_list = list()
        input_username = raw_input("登录用户名:").strip()
        input_password = raw_input("登录密码:").strip()
        self.user_correct = self.UserCorrect(input_username, input_password)
        self.user_exist = self.UserExist(input_username)
        if self.user_correct == 1:
            print "欢迎登录:", input_username
        elif self.user_exist == 1:
           print "密码错误"
           self.login_try_count += 1
           print "%s 还有 %d 次尝试机会" %(input_username,\
                   self.login_limit_count - self.login_try_count)
           if self.login_try_count < 3:
               self.UserLogin()
           else:
               print "%s 已经尝试3次登录失败" %(input_username)
               self.UserExit()
        elif self.user_exist == 0:
            print "%s 用户不存在" %(input_username)
            print "请去注册"
            self.UserRegister()

    def UserExit(self):
        print "Bye Bye"
        exit(0)

    def ProcessUserChoice(self):
        if self.userchoice == 1:
            self.UserRegister()
        elif self.userchoice == 2:
            self.UserLogin()
        elif self.userchoice == 3:
            self.UserExit()
        else:
            self.userchoice = int(raw_input("请输入正确的选择,1或者2或者3:"))
            self.ProcessUserChoice()

    def InitInterface(self):
        failedCount = 0
        login_status = dict()
        u_profile_dict_list = list()
        while True:
            try:
               self.userchoice = int(raw_input("----------------\n"
                                    "1:注册\n"
                                    "2:登录\n"
                                    "3:退出\n"
                                    "----------------\n"
                                    "请选择:").strip())
               self.ProcessUserChoice()
            except Exception as e:
                print e
                self.InitInterface()

def Main():
    user = User()
    user.InitInterface()

if __name__ == "__main__":
    Main()