Python learning-Implement User Password Logon, three wrong locks, python User Password

Python learning-Implement User Password Logon, three wrong locks, python User Password

Job Requirements:

Implementation ideas:

Method 1:

#! /Usr/bin/env python3 #-*-coding: UTF-8-*-count = 0 # counter username = "aaa" # logon username userpassword = "asd" # logon password # Read the blacklist user f = open ("aaa.txt ", "r") file_list = f. readlines () f. close () lock = [] name = input ("Login Username:") # determine whether the user is blacklisted for I in file_list: line = I. strip ("\ n") lock. append (line) if name in lock: print ("your account is locked. Contact the administrator. ") Else: # if the user is not in the blacklist, determine whether the user exists if name = username: # if the password is wrong three times in a row, lock the account while count <3: password = input ("Login password:") if name = username and password = userpassword: print ("Welcome % s! "% Name) break else: print (" account and password do not match ") count + = 1 else: print (" sorry, your account has been locked for three consecutive wrong attempts, contact the administrator. ") F = open (" aaa.txt "," w + ") li = ['% s' % username] f. writelines (li) f. close () else: print ("the user name does not exist. Enter the correct user name. ")

Method 2:

1. create two new files, account.txtand account_lock.txt. in the account, enter aaa 123 2. Then, account.txtformat is read only. account_lock.txt adopts the read/write Format 3 import sys, OS 4 count = 0 5 name_list = [] 6 while count <3: 7 name = input ("Enter the User name:") 8 lock_file = open ("account_lock.txt", "r +") # Read the blacklist, "r + ": open a file for reading and writing. "r": open the file in read-only mode 9 lock_list = lock_file.readlines () 10 #. readlines (): reads the entire file at a time, analyzes the content into a list of rows, and. same as read () 11 #. readline (): reads a row at a time and is used when the memory is insufficient. readline () 12 for lock_line in lock_list: 13 lock_line = lock_line.strip ('\ n') 14 if name = lock_line: 15 # if the input user name is in the blacklist, the program unexpectedly exits 16 sys. exit ("User % s has been locked. Please contact the Administrator to unlock it. "% name) 17 # Read the correct username and password 18 user_file = open (" account.txt "," r ") 19 user_list = user_file.readlines () 20 for user_line in user_list: 21 (user, password) = user_line.strip ('\ n '). split () 22 name_list.append (user_line )#. append (): Used to add a new object 23 print ("---------", name_list) 24 at the end of the list # the user name is correct. The password input count is 25 if name = user: 26 I = 027 while I <:28 passwd = input ("Enter password:") 29 if passwd = password: 30 print ("Welcome % s login" % name) 31 sys. exit (0) 32 else: 33 if I <print ("User % s Password error, please enter again, there is a % d opportunity. "% (name, 2-i) 35 I ++ = 136 else: 37 lock_file.write (name + '\ n') 38 sys. exit ("User % s enters the wrong password three times. The user will be locked and exited. Please contact the Administrator to unlock the password. "% name) 39 else: 40 pass41 else: 42 # username input error count 43 if count <print (" User % s does not exist, please enter again, there are % d chances "% (name, 2-count) 45 count + = 146 else: 47 sys. exit ("User % s does not exist, exit" % name) 48 # Close opened file 49 lock_file.close () 50 user_file.close ()