Python implements username and password verification

The examples in this article share the specific code of python to achieve user name and password verification for your reference. The specific content is as follows

Need to implement function

Enter the username and password;
The welcome message will be displayed after successful authentication;
Locked after three consecutive mistakes;

readme：

Please see the code comments for details, I'm lazy
1、 Enter username and password
2、 Determine whether the username is in the locked file
3、 Determine whether the username and password are correct

Code

 # Enter username and password
 # A welcome message will be displayed after successful authentication
 # Locked after three consecutive incorrect entries
count =0while True:
 # Enter username and password
 username =input("Username:")
 password =input("Password:")
 # Open the username and password file
 f =open('login_true.txt')
 # Open locked username file
 f4 =open('login_lock.txt')
 # Determine whether the input user name exists in the locked file
 for line in f4:
 user_name2 = line.strip()if username == user_name2:print("username is locked!")breakelse:
 # Determine whether the username and password are correct
 for line in f:
  str = line.strip()
  str2 =','
  user_name = str[:str.index(str2)]
  pass_word = str[str.index(str2)+1:]
  # print(user_name, pass_word)
  # The username and password are correct, print the welcome message and clear the counter out of the loop
  if username == user_name and password == pass_word:print("welcome "+ username)
  count =0break
  # The user name is correct, the password is wrong, print the prompt message, the counter is incremented by 1, and judge whether the counter reaches 3
  elif username == user_name and password != pass_word:print("wrong password!")
  count +=1print(count)
  # The counter reaches 3 times, and the user name is written into the locked file
  if count ==3:
   f2 =open('login_lock.txt',"a+")
   f2.write(username+'\n')
   f2.close()
   count =0breakelse:print("please check out your username!")
  count =0
 f.close()

note

Create two new files in the same directory of the py file:
login_true.txt ———store the username and password in advance

login_lock.txt———-used to store the locked user name

The above is the whole content of this article, I hope it will be helpful to everyone's study.