class Library(object):

    def __init__(self, book):
        self.book = book

    def add_item(self, book):
        mylist.append(book)
        return mylist


if __name__ == '__main__':
    booklist = []
    Book1 = Book(1, 'Bookname1', "$30")
    Book2 = Book(2, 'Bookname2', "$10")
    Book1.show()
    Book1.get_attribute_string()

class Book(object):

    def __init__(self, ID, name, price):
        self.ID = ID
        self.name = name
        self.price = price

    def show(self):
        print(self.ID, self.name, self.price)

    def get_attribute_string(self):
        print(str(self.ID) + '_' + str(self.name) + '_' + str(self.price))

    def get_id(self):
        print(self.ID)

    def get_name(self):
        print(self.name)

    def get_price(self):
        print(self.price)