Write a library of example

 

 

the Users = { " wulaoshi " : " 123456 " } 
login_users = {} 
Books = {}
 DEF the Register ():
     , Ltd. Free Join the Users
     the while 1 : 
        username = the INPUT ( " Please enter the user name you want to register: " )
         IF  not len (username )> = 7 :
             Print ( " the username you entered is less than 7, please re-enter " )
             the Continue 
        for i in username:
             IF  not(i> = " A "  and i <= " z " ) and i =! " _ " :
                 Print ( " The user name you enter must be lowercase or _! " )
                 BREAK 
        the else : 
             IF username in the Users:
                 Print ( " the username you entered already exists, please re-enter! " )
                 the Continue 
        BREAK 
    the while 1 : 
        password = the iNPUT ( " Please enter the password you want to use: ")
         IF  not len (password)> = 7 :
             Print ( " The password you entered is less than 7, please re-enter " )
             the Continue 
        for i in password:
             IF  not (i> = " A "  and i <= " z " ) and ! = I " _ "  and  Not (I> = " 0 "  and I <= " . 9 " ):
                 Print ( "The password you enter must be lowercase letters, numbers or _! " )
                 BREAK 
        the else : 
            password2 = the INPUT ( " Please enter the password you want to use again: " )
             IF password == password2: 
                the Users [username] = password
                 Print ( " % s registration has been successful! " % username)
                 BREAK 
            the else :
                 Print ( " ! Please enter the password twice inconsistent re-enter! " ) 
  
DEF the Login ():
     , Ltd. Free Join the Users
     the while 1: 
        Login_username = the INPUT ( " Please enter your login user name: " ) 
        login_password = the INPUT ( " Please enter the password: " )
         IF login_username in the Users:
             IF login_password == the Users [login_username]:
                 Print ( " % S user logs in successfully ! " % login_username) 
                login_users [login_username] = None
                 BREAK         
        Print ( " you enter a user name and password is incorrect, please re-enter! " ) 

DEF addBook ():
    Global Books 
    BookID = INPUT ( " Enter a new book book ID: " )
     IF BookID Not  in books.keys ():
         for I in BookID:
             IF  Not (I> = " 0 "  and I <= " . 9 " ) :
                 Print ( " enter the book id is not a pure numbers, please re-enter " )
                 BREAK 
        the else : 
            book_name = the iNPUT ( " Please enter the name of the new book: " )
            IF book_name.strip =! "" : 
                Books [the BookID] = book_name
                 Print ( " ! Add Books"% s "success " % book_name) 

DEF listbooks ():
     for k, v in books.items ():
         Print ( " Book No S%:% S " % (k, v)) 
            
# the Register () 
# the Login () 

Print ( " Welcome to glory Road Library system: " )
 Print ( " "" 
    list of commands: 
    registered users please enter: register 
    Please enter: login
    Adding new books: addbook 
    See all books: listbooks 
"" " )
 the while 1 : 
    the Command = the INPUT ( " Please enter a command to operate: " )
     IF  not the Command in [ " the Register " , " the Login " , " addBook " , " listbooks " ]:
         Print ( " command you entered does not exist, please re-enter! " )
         the Continue 
    Exec (the command + " () " )