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the factory method design pattern is a creational pattern that provides an interface for creating objects in a superclass, but allows subclasses to alter the type of objects that will be created. this pattern promotes loose coupling between client code and the objects being created.
to implement the factory method pattern, follow these steps:
1. define an interface or an abstract class that declares the factory method. this method will be responsible for creating objects.
2. create concrete classes that implement the interface or extend the abstract class. each subclass will provide its own implementation of the factory method to create specific objects.
3. use the factory method to create objects without explicitly specifying their classes.
here is an example implementation of the factory method pattern in python:
in this example, `animal` is the product interface with a `speak` method. `dog` and `cat` are concrete products that implement the `speak` method. `animalfactory` is the creator interface with a `create_animal` method. `dogfactory` and `catfactory` are concrete creators that implement the `create_animal` method to create specific instances of `dog` and `cat`.
using the factory method pattern allows you to add new types of animals without modifying existing client code, promoting extensibility and flexibility in your design.
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