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Когда в методе используется self.attr = ..., Python создает (или обновляет) атрибут у конкретного экземпляра, на котором был вызван метод. Это происходит динамически — никаких предварительных объявлений атрибутов в Python не требуется. Экземпляр хранит свои собственные данные, и self всегда ссылается именно на него.

Таким образом, присваивание через self не влияет на атрибуты класса, если такие были, и не затрагивает другие экземпляры. Это ключевое отличие между атрибутами класса и экземпляра: одни общие для всех объектов, другие — индивидуальны.

Python: задачки и вопросы
Когда в методе используется self.attr = ..., Python создает (или обновляет) атрибут у конкретного экземпляра, на котором был вызван метод. Это происходит динамически — никаких предварительных объявлений атрибутов в Python не требуется. Экземпляр хранит свои собственные данные, и self всегда ссылается именно на него.

Таким образом, присваивание через self не влияет на атрибуты класса, если такие были, и не затрагивает другие экземпляры. Это ключевое отличие между атрибутами класса и экземпляра: одни общие для всех объектов, другие — индивидуальны.
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Когда в методе используется self.attr = ...

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