29.10/classes.py - master - i_918/python_wednesday

29.10/classes.py
72 строки2 KB
i_918
практика по классам
29 окт 2025, 09:40
29 окт 2025, 09:40f3804b6
from abc import ABC, abstractmethod
from datetime import datetime


class Printable(ABC):
    @abstractmethod
    def print_info(self):
        pass


class Book(Printable):
    def __init__(self, title, author, year):
        self.title = title
        self.author = author
        self.year = year

    def info(self):
        return f'Title: {self.title}, author: {self.author}, year: {self.year}'

    def print_info(self):
        return self.info()

    def __str__(self):
        return self.info()

    def __eq__(self, other):
        if not isinstance(other, Book):
            return False
        return (self.title == other.title and
                self.author == other.author and
                self.year == other.year)

    @property
    def age(self):
        return datetime.now().year - self.year

    @classmethod
    def from_string(cls, book_str):
        parts = book_str.split(', ')
        if len(parts) != 3:
            raise ValueError("Строка должна быть в формате: 'название, автор, год'")
        title, author, year_str = parts
        try:
            year = int(year_str)
        except ValueError:
            raise ValueError("Год должен быть целым числом")
        return cls(title, author, year)


class Ebook(Book):
    def __init__(self, title, author, year, format):
        super().__init__(title, author, year)
        self.format = format

    def info(self):
        return f'{self.title}, {self.year}, {self.author}, format: {self.format}'

    def print_info(self):
        return self.info()


if __name__ == "__main__":
    book = Book("1984", "Джордж Оруэлл", 1949)
    ebook = Ebook("1984", "Джордж Оруэлл", 1949, "PDF")

    print(book)
    print(f"Возраст книги: {book.age} лет")
    print(book.print_info())

    print()
    print(ebook)
    print(ebook.print_info())