35 lines
1.5 KiB
Python
35 lines
1.5 KiB
Python
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from abc import ABC, abstractmethod
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# Интерфейс для элементов, которые могут быть посещены
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class Element(ABC):
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@abstractmethod
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def accept(self, visitor): pass
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# Конкретные элементы
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class Book(Element):
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def __init__(self, title, author):
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self.title = title
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self.author = author
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def accept(self, visitor): visitor.visit_book(self)
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class Movie(Element):
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def __init__(self, title, director):
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self.title = title
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self.director = director
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def accept(self, visitor): visitor.visit_movie(self)
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# Интерфейс для посетителей
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class Visitor(ABC):
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@abstractmethod
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def visit_book(self, book): pass
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@abstractmethod
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def visit_movie(self, movie): pass
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# Конкретный посетитель
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class ConcreteVisitor(Visitor):
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def visit_book(self, book): print(f"Книга: {book.title}, Автор: {book.author}")
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def visit_movie(self, movie): print(f"Фильм: {movie.title}, Режиссер: {movie.director}")
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# Создаем элементы
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book1, book2, movie1 = Book("1984", "Джордж Оруэлл"), Book("Мастер и Маргарита", "Михаил Булгаков"), \
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Movie("Начало", "Кристофер Нолан")
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# Создаем посетителя
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print_visitor = ConcreteVisitor()
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# Посещаем элементы
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for element in [book1, book2, movie1]: element.accept(print_visitor)
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