Create a library tracker

Here is a simple yet functional Library Tracker concept implemented in Python. This program helps you manage books in a library, tracking which books are available, borrowed, and who borrowed them. It includes basic features like adding books, borrowing, returning, and listing books.

python
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class LibraryTracker:
    def __init__(self):
        # Stores books as {book_id: {"title": str, "author": str, "borrowed_by": None or str}}
        self.books = {}
        self.next_id = 1

    def add_book(self, title, author):
        book_id = self.next_id
        self.books[book_id] = {"title": title, "author": author, "borrowed_by": None}
        self.next_id += 1
        print(f'Book added: "{title}" by {author} (ID: {book_id})')

    def borrow_book(self, book_id, borrower_name):
        if book_id not in self.books:
            print("Book ID not found.")
            return
        if self.books[book_id]["borrowed_by"]:
            print(f'Book "{self.books[book_id]["title"]}" is already borrowed by {self.books[book_id]["borrowed_by"]}.')
        else:
            self.books[book_id]["borrowed_by"] = borrower_name
            print(f'Book "{self.books[book_id]["title"]}" has been borrowed by {borrower_name}.')

    def return_book(self, book_id):
        if book_id not in self.books:
            print("Book ID not found.")
            return
        if not self.books[book_id]["borrowed_by"]:
            print(f'Book "{self.books[book_id]["title"]}" is not currently borrowed.')
        else:
            borrower = self.books[book_id]["borrowed_by"]
            self.books[book_id]["borrowed_by"] = None
            print(f'Book "{self.books[book_id]["title"]}" has been returned by {borrower}.')

    def list_books(self):
        if not self.books:
            print("No books in the library.")
            return
        print("Library books:")
        for book_id, info in self.books.items():
            status = f"Borrowed by {info['borrowed_by']}" if info["borrowed_by"] else "Available"
            print(f"ID: {book_id} | Title: {info['title']} | Author: {info['author']} | Status: {status}")

# Example usage:
library = LibraryTracker()
library.add_book("1984", "George Orwell")
library.add_book("To Kill a Mockingbird", "Harper Lee")

library.list_books()
library.borrow_book(1, "Alice")
library.borrow_book(2, "Bob")
library.list_books()

library.return_book(1)
library.list_books()

This code provides a straightforward way to track books in a library, including their availability and who has borrowed them. You can expand it with saving/loading to files, due dates, and more complex user management as needed.