li=[1,3,4,6]

li

[1, 3, 4, 6]

type(li)

list

li.append(44)

li

[1, 3, 4, 6, 44]

#your choice
class Library:
    def __init__(self,listofbooks):
        self.availablebooks=listofbooks
    def displayAvailablebooks(self):
        print("The books we have in our library are as follows:")
        print("================================")
        for book in self.availablebooks:
            print(book)  

    def lendBook(self,requestedBook):
        if requestedBook in self.availablebooks:
            print("The book you requested has now been borrowed")
            self.availablebooks.remove(requestedBook)
        else:
            print("Sorry the book you have requested is currently not in the library")
                  
        
    def addBook(self,returnedBook):
        self.availablebooks.append(returnedBook)
        print("Thanks for returning your borrowed book")            
        
class Student:
    def requestBook(self):
        print("Enter the name of the book you'd like to borrow>>")
        self.book=input()
        return self.book

    def returnBook(self):
        print("Enter the name of the book you'd like to return>>")
        self.book=input()
        return self.book

    
library=Library(["php","seo","python"])
student=Student()

print(""" ======LIBRARY MENU=======
              1. Display all available books
              2. Request a book
              3. Return a book
              4. Exit
              """)

choice=int(input("Enter Choice:"))
if choice==1:
    library.displayAvailablebooks()
elif choice==2:
    library.lendBook(student.requestBook())
elif choice==3:
    library.addBook(student.returnBook())
elif choice==4:
    quit()

 ======LIBRARY MENU=======
              1. Display all available books
              2. Request a book
              3. Return a book
              4. Exit
              
Enter Choice:4

#your choice
class Library:
    def __init__(self,listofbooks):
        self.availablebooks=listofbooks
    def displayAvailablebooks(self):
        print("The books we have in our library are as follows:")
        print("================================")
        for book in self.availablebooks:
            print(book)  

    def lendBook(self,requestedBook):
        if requestedBook in self.availablebooks:
            print("The book you requested has now been borrowed")
            self.availablebooks.remove(requestedBook)
        else:
            print("Sorry the book you have requested is currently not in the library")
                  
        
    def addBook(self,returnedBook):
        self.availablebooks.append(returnedBook)
        print("Thanks for returning your borrowed book")            
        
class Student:
    def requestBook(self):
        print("Enter the name of the book you'd like to borrow>>")
        self.book=input()
        return self.book

    def returnBook(self):
        print("Enter the name of the book you'd like to return>>")
        self.book=input()
        return self.book

    
library=Library(["php","seo","python"])
student=Student()

print(""" ======LIBRARY MENU=======
              1. Display all available books
              2. Request a book
              3. Return a book
              4. Exit
              """)

choice=int(input("Enter Choice:"))
if choice==1:
    library.displayAvailablebooks()
elif choice==2:
    library.lendBook(student.requestBook())
elif choice==3:
    library.addBook(student.returnBook())
elif choice==4:
    quit()

 ======LIBRARY MENU=======
              1. Display all available books
              2. Request a book
              3. Return a book
              4. Exit
              
Enter Choice:3
Enter the name of the book you'd like to return>>
php
Thanks for returning your borrowed book

#your choice
class Library:
    def __init__(self,listofbooks):
        self.availablebooks=listofbooks
    def displayAvailablebooks(self):
        print("The books we have in our library are as follows:")
        print("================================")
        for book in self.availablebooks:
            print(book)  

    def lendBook(self,requestedBook):
        if requestedBook in self.availablebooks:
            print("The book you requested has now been borrowed")
            self.availablebooks.remove(requestedBook)
        else:
            print("Sorry the book you have requested is currently not in the library")
                  
        
    def addBook(self,returnedBook):
        self.availablebooks.append(returnedBook)
        print("Thanks for returning your borrowed book")            
        
class Student:
    def requestBook(self):
        print("Enter the name of the book you'd like to borrow>>")
        self.book=input()
        return self.book

    def returnBook(self):
        print("Enter the name of the book you'd like to return>>")
        self.book=input()
        return self.book

    
library=Library(["php","seo","python"])
student=Student()

print(""" ======LIBRARY MENU=======
              1. Display all available books
              2. Request a book
              3. Return a book
              4. Exit
              """)

choice=int(input("Enter Choice:"))
if choice==1:
    library.displayAvailablebooks()
elif choice==2:
    library.lendBook(student.requestBook())
elif choice==3:
    library.addBook(student.returnBook())
elif choice==4:
    quit()

 ======LIBRARY MENU=======
              1. Display all available books
              2. Request a book
              3. Return a book
              4. Exit