190327 Python登录接口

#！Author:John
# _*_ coding: utf-8 _*_
#编写登录接口
#输入用户名密码
#认证成功后显示欢迎信息
#输错三次后锁定
import sys, os, getpass


limit = 3
count = 0
account_file = "account.txt"
lock_file = "locked.txt"

while count < limit:
    username = input("Please input username:")
    # 打开文件后第一步输入用户名，打开lock文件，检查改用户是否已经被锁定

    f1 = open(lock_file,'r')
    # r后面不能加b，加b是以bytes类型打开，输入的用户名、密码是字符串str和bytes不匹配
    for line in f1.readlines():
        if username == line.strip():
            sys.exit("User %s has been locked!"%username)
    f1.close()
    password = input("Please input password:")

    f = open(account_file, 'r')
    match_flag = False
    for line in f.readlines():
        user,pwd=line.strip().split()   # 这里的知识点需要掌握
        if user==username and pwd == password:
            print(username,"has match successfully!")
            match_flag=True
            break
    f.close()
    if match_flag==False:
        print("Username or password is incorrect!")
        count+=1
    else:
        print("Welcome login Python Learning system!")
        break
else:
    print("Your account has been locked!")
    f1=open(lock_file,"a")
    f1.write(username+'
')
    f1.close()