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OOP & classes

Classes, instances, methods, dataclasses, and object-oriented design in Python.

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OOP & classes medium

Visitor Pattern in Python: Double Dispatch Demo

Demonstrates the Visitor design pattern with double dispatch so operations on Dog and Cat objects are selected at runtime without modifying their classes.

visitor-pattern design-patterns double-dispatch
Python 
class Animal:
    def accept(self, visitor):
        visitor.visit(self)

class Dog(Animal):
    def speak(self):
        return "Woof!"

class Cat(Animal):
    def speak(self):
        return "Meow!"

class SoundVisitor:
    def visit(self, animal):
        if isinstance(animal, Dog):
            return self.visit_do…
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