How to Implement a Factory Method by Type String in Python

class Animal:
    def speak(self):
        raise NotImplementedError


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


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


class AnimalFactory:
    @staticmethod
    def create(animal_type: str) -> Animal:
        animal_types = {
            "dog": Dog,
            "cat": Cat
        }
        animal_class = animal_types.get(animal_type.lower())
        if animal_class is None:
            raise ValueError(f"Unknown animal type: {animal_type}")
        return animal_class()


if __name__ == "__main__":
    factory = AnimalFactory()
    for animal in ["dog", "cat", "bird"]:
        try:
            instance = factory.create(animal)
            print(f"{animal}: {instance.speak()}")
        except ValueError as e:
            print(f"{animal}: {e}")