third.py - master - nk1383/oop

third.py
60 строк2 KB
Анастасия Ковалевич
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24 окт 2025, 17:31
24 окт 2025, 17:31681107c
from datetime import datetime


class Book:
    def __init__(self, title: str, author: str, year: int) -> None:
        self.title = title
        self.author = author
        self.year = year

    def info(self) -> str:
        return f"Title: {self.title}, author: {self.author}, year: {self.year}"

    def __str__(self) -> str:
        return f'"{self.title}" by {self.author} ({self.year})'

    def __eq__(self, other: object) -> bool:
        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) -> int:
        current_year = datetime.now().year
        return current_year - self.year

    @classmethod
    def from_string(cls, book_str: str) -> "Book":
        try:
            title, author, year_str = book_str.split(",")
            title = title.strip()
            author = author.strip()
            year = int(year_str.strip())
            return cls(title, author, year)
        except (ValueError, IndexError) as e:
            raise ValueError(f"Неверный формат строки для книги: {book_str}") from e


class Ebook(Book):
    def __init__(self, title: str, author: str, year: int, format_: str) -> None:
        super().__init__(title, author, year)
        self.format = format_

    def info(self) -> str:
        return super().info() + f", format: {self.format}"


if __name__ == "__main__":
    book = Book("Гарри Поттер", "Дж. Роулинг", 1997)
    book2 = Book.from_string("Властелин колец, Дж. Р. Р. Толкин, 1954")
    book3 = Book("Гарри Поттер", "Дж. Роулинг", 1997)

    print(book == book3)
    print(book2)
    print(f"Возраст: {book2.age} лет")
    print(book.info())
    print(book3.age)