Week1-作业：用户登陆程序

#!/usr/bin/en python
# Author:lijun

'''

　　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
#import  getpass


dir = os.getcwd()
passfile = dir+os.sep + "passwd.txt"
blacklistfile = dir + os.sep + "blacklist.txt"

#读取用户名密码文件：
f = open(passfile)
user_passwd = {}
for line in f:
    l = line.strip().split(",")
    user_passwd[l[0]] = l[1]
f.close()

#读取黑名单
b = open(blacklistfile)
blacklist=[]
for line in b:
    blacklist.append(line.strip())
b.close()

error_count=0
while error_count<3:
    error_count = error_count + 1
    username = input("Login username:")
    password = input('passwd:')

    if username in blacklist:
        print("您的用户名已经被锁定，请联系管理员。")
        break

    if  username in user_passwd.keys():
        if user_passwd[username] == password:
            print("Login successfull. Welcome!")
            break
    else:
        print("您输入的账户不存在,请重新输入。")

    if error_count == 3:
        if username in user_passwd.keys():
            blacklist=open(blacklistfile,"a+")
            blacklist.writelines("\n"+username)
            blacklist.close()
            print("您已累计输错三次，您的账号[%s]已经被锁定，请联系管理员." %username)
        else:
            print("您输入的账号[%s]不存在，已经累计三次输入失败，程序将退出。." %username)