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System design patterns

Sharding, load balancing, CAP tradeoffs, and scaling patterns — interview and production ready.

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System design patterns easy

How to Implement a Factory Method by Type String in Python

A factory method maps a type string to a class, creating and returning the appropriate object instance while handling unknown types gracefully.

factory-pattern design-patterns oop
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 = {
          …
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