15.py

class Book:
	def __init__(self,title,author,borrowed=False):
		self.title=title
		self.author=author
		self.borrowed=borrowed
	def info(self):
		if self.borrowed:
			print(f'Book: {self.title} by {self.author} | Borrowed')
		else:
			print(f'Book: {self.title} by {self.author} | Available')
class Library:
	def __init__(self):
		self.books=[]
	def add_book(self,book):
		self.books.append(book)
		print(f'Book added: {book.title}')
	def show_books(self):
		for book in self.books:
			book.info()
	def borrow_book(self,title):
		for book in self.books:
			if book.title==title:
				if book.borrowed:
					print(f'You borrowed {self.title}')
				else:
					book.borrowed==True
					print(f'Book already borrowed')
	def return_book(self,title):
		for book in self.books:
			if book.title==title:
				book.borrowed=False
			print(f'Book returned: {book.title}')
b1=Book("Python Basics","John")
b2=Book("AI Guide","Andrew")
lib=Library()
lib.add_book(b1)
lib.add_book(b2)
lib.show_books()

lib.borrow_book("Python Basics")

lib.show_books()
lib.return_book("Python Basics")
lib.show_books()