전략 패턴

SOLID 원칙의 open closed 원칙과 일치하는 내용이다

class Animal:
  def speak(self):
    pass

class Cat(Animal):
  def speak(self):
    print("meow")

class Lion(Animal):
  def speak(self):
    print("roar")

def makeSpeak(animal:Animal):
  animal.speak()

def createAnimal(input_str:str)->Animal:
  if input_str == "cat":
    return Cat()
  elif input_str == "lion":
    return Lion()
-------------console-------------------    
input_str = input('choose animal: ')

animal = createAnimal(input_str)
makeSpeak(animal)