Python combat-write basic landing portals

1. Requirements

* Default user name and password, enter user name and password.

* Authentication failed, return failure information, successful authentication, return success information.

* If the user entered three password error, then lock the machine

2, involving knowledge points

* File operations, create a file, write files, read files, append files

* Loop, set the number of user allowed errors, use while loop

* Judge, determine whether the user is locked user if...else ...

3. Analysis

* Use file operations to create a file as a database file. Role 1 Determines whether the user ID in this file, role 2 will fail the user to write the library of the file.

* Set the loop, jump out of the loop correctly, and continue the loop incorrectly.

4. Flowchart

5. Code

1Default_accound ="Xiefangyuan" #set default account and password2Default_password ="19910329"    #set default account and password3user ="192.9.169.49"   #set the user ID to lock the user and subsequently add functions such as acquiring Machine Mac4sql = open ("Sql.log","a")#a database file is recommended for storing user identities5Sql.write ("database files, mistakenly deleted! \ n")#Write6Sql_r = open ("Sql.log","R")#Read database file contents7 ifUserinchSql_r.read ():#determine if the user is locked out8     Print("the user is locked out of the user and cannot be used! ")9 Else:Tenn = 3#set the number of cycles One      whilen >0: An = n-1 -account = str (input ("User name:"))#user Input account password -Password = str (input ("Password:"))#user Input account password the         ifaccount = = Default_accound andPassword = =Default_password: -             Print("enter right, entering! ") -              Break -         Else: +             Print("input Error, please re-enter! You have a chance to do it again.". Format (n)) -     Else: +sql = open ("Sql.log","a") ASql.write (user)#Write User ID at         Print("the number of errors has reached three times, the user is locked! ")

Python combat-write basic landing portals