Python实战之用类的静态方法实现登录验证

#!usr/bin/env Python3
# -*-coding:utf-8-*-

__author__="William"
#define a class,just to learn to use class.
class Login(object):
    #those variable just use to be a flag.
    count = 3
    Flag = 1
    wrong_user_flag = 1
    wrong_user = ''
    #define a staticmethod function,just like a normal function to login
    @staticmethod
    def login():
        while Login.count > 0:
            if Login.wrong_user_flag == 0:
                username = Login.wrong_user
            else:
                username = input("Please input your username:>>>")
                Login.wrong_user = username
            password = input("Pleasw input your password:>>>")
            #call verify function
            Login.verify(username,password)
            Login.count -= 1
        else:
            if Login.Flag != 1:
                #add the wrong password user to black user list.
                with open("black_user.txt",'a') as fp:
                    fp.write("
")
                    fp.write(username)
                    fp.write("
")
    #define a staticmethod to verify the user info.
    @staticmethod
    def verify(user_name,password):
        #with to use to open a file.
        with open("black_user.txt", 'r') as fp:
            data = ''.join(fp.readlines()).split('
')
        if user_name in data:
            print("Your are locked")
            Login.count = 0
        else:
            if user_name == "William" and password =="123":
                print("Success,welcome to login")
                Login.Flag = 1
                Login.count = 0
            else:
                print("Wrong username or password")
                Login.Flag = 0
                Login.wrong_user_flag = 0
if __name__=='__main__':
    #To make a  instance.
    u1 = Login()
    #to call login
    u1.login()