Answer to Question #322971 in Python for DANIE

Question

1.      Create a library of books in Python, with the following attributes.

(i) Title of book

(ii) Author of book

(iii) ISBN (International Standard Book Number)

(iv) Year of Publication.

(v) Book Classification (e.g. Fiction, Science, Art)

Answer 1

class Book:
    def __init__(self, title, author, isbn=None, year=None, rubric=None):
        self._title = title
        self._author = author
        self._isbn = isbn
        self._year = year
        self._class = rubric



    def __str__(self):
        res = "Title: " + self._title
        res += "\nAuthor: " + self._author
        if self._isbn:
            res += "\nISBN: " + str(self._isbn)
        if self._year:
            res += "\nYear: " + str(self._year)
        if self._class:
            res += "\nClass: " + self._class
        res += '\n'
        return res


def main():
    library = []
    library.append(Book("Harry Potter and the Sorcerer's Stone", 
                        "J.K.Rowling", year=1998, rubric="fantasy"))
    library.append(Book("The Art of Computer Programming, vol.1", "Donald E.Knuth", 
                        9780201896831, 1998, "scince"))
    library.append(Book("The Louvre: All the Paintings Paperback", "Erich Lessing",
                        year=2020, rubric="art"))
    library.append(Book("The Ultimate Hitchhiker's Guide", "Douglas Adams",
                        year=1996))
    
    for book in library:
        print(book)


if __name__ == '__main__':
    main()