Object-Oriented Programming (OOP) Book Lending System in Python

import sys

class BookLendingSystem:

    def __init__(self):
        self.available_books = {
            1: "The Great Gatsby",
            2: "To Kill a Mockingbird",
            3: "1984",
            4: "Pride and Prejudice"
        }
        self.borrowed_books = {}


    def display_menu(self):

        print("\nWelcome to the Book Lending System!")
        menu = {
            1 : "View Available Books" ,
            2 : "Borrow a Book",
            3 : "Return a Book",
            4 : "View Borrowed Books",
            5 : "Exit"
        }
        for key, value in menu.items():
            print(f"{key}. {value}")


    def view_available_books(self):
        print("--- The Available Books ---")
        for key, value in self.available_books.items():
            print(f"{key}. {value}")


    def borrow_book(self):
        self.view_available_books()
        book_num = int(input("\nEnter the book number to borrow: ").strip())
        self.name = input("\nEnter your name: ").strip()
        if not self.available_books:
            pass
        else:
            for key, value in  self.available_books.items():
                if key == book_num:
                    print(f'You have borrowed "{value}". Please return it on time.')
                    self.borrowed_books[key] = value


    def view_borrowed_books(self):
        if not self.borrowed_books:
            pass
        else:
            print("\n--- Borrowed Books ---")
            for key, value in self.borrowed_books.items():
                print(f"{key}. {value} - Borrowed by {self.name}.")


    def return_book(self):
        if not self.borrowed_books:
            pass
        else:
            self.view_borrowed_books()
            book_num = int(input("\nEnter the book number to return: ").strip())
            for key, value in  self.borrowed_books.items():
                print(f'Thank you, {self.name}, for returning "{value}".')


    def run(self):
       while True:
            self.display_menu()
            choice = input("\nChoose an option: ").strip()
            if choice == "1":
                self.view_available_books()
            if choice == "2":
                self.borrow_book()
            if choice == "3":
                self.return_book()
            if choice == "4":
                self.view_borrowed_books()
            if choice == "5":
                sys.exit()

system = BookLendingSystem()
system.run()


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