forharis.py

class Library():
    books = []

    def addBooks(self, book):
        self.books.append(book)

    def borrowBook(self, bookname):
        for book in self.books:
            if book.name == bookname:
                return self.books.pop()
        else:
            return "No such book found"


class Book():

    bookname = ""

    @property
    def name(self):
        return self.bookname

    def __init__(self, name):
        self.bookname = name


class Person():

    borrowedbooks = []

    def borrowbook(self, book):
        self.borrowedbooks.append(book)

    @property
    def showBorrowed(self):
        return self.borrowedbooks


if __name__ == "__main__":
    person = Person()
    bok1 = Book("Harry Potter")
    bok2 = Book("Ringenes Herre")
    library = Library()

    library.addBooks(bok1)
    library.addBooks(bok2)
    person.borrowbook(library.borrowBook("Harry Potter"))
    print(person.showBorrowed)