Python learning _1_ for simple login judgment

"""
Job: Let the user enter a user name and password, verify three times, three unsuccessful, lock the last user.
"""


Def login1 ():
"" The method of implementing login Verification yourself:
According to what has been learned to think of the method. The disadvantage is that the user name password can only store one.
"""

User_info_file = open (' User_info.txt ', ' R ') # User name and password store file
User_info_list = User_info_file.readlines () # Correct user name and password storage queue
Username = User_info_list[0].strip () # Correct user name
Password = user_info_list[1] # correct password
User_info_file.close ()

For I in range (3):

Username_input = input (' Please output User name: ')
Password_input = input (' Please enter password: ')
Login_count = 2-i # Determine how many times you can enter.
Lock_user_file = open (' Lock_user.txt ', ' R ') # blacklist file

For line in Lock_user_file.readlines ():
If Line.strip () = = Username_input:
Print (' User cannot log in, please contact admin to unlock. ‘)
Return False

Else
If username = = Username_input and Password = = Password_input:
Print (' Login successful ')
Return True
elif i = = 2:
Lock_user_file_add_user = open (' Lock_user.txt ', ' a ')
Lock_user_file_add_user.write (' \ n ')
Lock_user_file_add_user.write (Username_input)
Lock_user_file_add_user.close ()
Print (' login exceeded ' limit, user is locked. ‘)
Return False
Else
Print (' Username or password error, you can also try to login ', Login_count, ' times. ‘)

Lock_user_file.close ()


Def login2 ():
"" "Comprehensive video textbook modified method, optimized place:

1. Use the WITH statement to open the file and avoid the close file.
2, you can split a row of different content, each row can save a user information.
"""

User_info_file = ' user_info.txt ' # User name and password store file
Lock_user_file = ' lock_user.txt ' # blacklist file

For I in range (3):

Username_input = input (' Please output User name: ')
Login_count = 2-i # Determine how many times you can enter.

With open (Lock_user_file, ' R ') as Lock_user: # To determine if the user is blacklisted, the blacklist jumps out, and the function feedback is false.
For line in Lock_user.readlines ():
If Line.strip () = = Username_input:
Print (' User cannot log in, please contact admin to unlock. ‘)
Return False

Password_input = input (' Please enter password: ')

With open (User_info_file, ' R ') as User_info: # Determines if the user is logged on successfully, the login succeeds, and the function feedback is true.
For line in User_info.readlines ():
Username, password = Line.strip (). Split ()
If username = = Username_input and Password = = Password_input:
Print (' Login successful ')
Return True

if i = = 2: # If user input error three times, then blacklist, and jump out, function feedback false.
Lock_user_file_add_user = open (Lock_user_file, ' a ')
Lock_user_file_add_user.write (' \ n ' +username_input)
Lock_user_file_add_user.close ()
Print (' login exceeded ' limit, user is locked. ‘)
Return False
Else
Print (' Username or password error, you can also try to login ', Login_count, ' times. ‘)

Python learning _1_ for simple login judgment