作业内容：
（1）编写登录接口
（2）认证成功后显示欢迎信息
（3）输错三次锁定
以下为代码，分为两个部分的代码，一是register.py，另一个是login.py；其中register.py实现的注册功能，客户可输入用户名密码，用户名密码保存在txt文件中；login.py代码实现的是以下几个功能点：
（1）如果不存在该用户名，提示用户未注册；
（2）如果用户名在黑名单中，提示用户与管理员联系；
（3）如果密码输入正确，登录成功；如果密码输入错误，可以试三次，如果三次仍未成功，则将该用户名锁定，并记录到TXT中，下次再输入该用户名，则提示该用户已被锁定。
register.py
#!/usr/bin/env python
#Author:Bing
print("---------------")
print("If you want to be a member of our web, please register.")
print("---------------")
username = input("please Enter your username: ")
password = input("please Enter your password: ")
filename1 = ‘username.txt‘
with open(filename1, ‘a‘) as file_object:
file_object.write(username)
file_object.write("\n")
filename2 = ‘password.txt‘
with open(filename2, ‘a‘) as file_object:
file_object.write(password)
file_object.write("\n")
login.py
#!/usr/bin/env python
#Author:Bing
usernames = []
passwords = []
usrpwddict = {}
count = 0
filename = ‘blacklist.txt‘
with open(‘username.txt‘) as file_object:
for username_ in file_object.readlines():
username_ = username_.strip(‘\n‘)
usernames.append(username_)
with open(‘password.txt‘) as file_object:
for password_ in file_object.readlines():
password_ = password_.strip(‘\n‘)
passwords.append(password_)
usrpwddict = dict(zip(usernames,passwords))
print(usernames)
print("---------------")
print("Login")
print("---------------")
usernamelist = []
usrpwd = []
username = input("Please enter your username: ")
if username not in usernames:
print("You have not register yet! please register first!")
else:
with open(‘blacklist.txt‘) as file_object:
for usernames_ in file_object.readlines():
usernames_ = usernames_.strip(‘\n‘)
usernamelist.append(usernames_)
for i in usernamelist:
if username == i:
print("Your Username is locked, Please contact the administrator!!!")
break
else:
while count < 3:
password = input("Please Enter your password: ")
if usrpwddict[username] == password:
print("congratulation!")
break
else:
count += 1
if count == 3:
print("You have tried too much times, now you are locked!")
with open(filename, ‘a‘) as file_object:
file_object.write(username)
file_object.write("\n")
break
print("try again!")