class Duck:
    def quack(self):
        print("這鴨子在呱呱叫")

    def feathers(self):
        print("這鴨子擁有白色與灰色羽毛")


class Person:
    def quack(self):
        print("這人正在模仿鴨子")

    def feathers(self):
        print("這人在地上拿起1根羽毛然後給其他人看")


def in_the_forest(duck):
    duck.quack()
    duck.feathers()


def game():

    donald = Duck()
    john = Person()
    in_the_forest(donald)
    in_the_forest(john) # put Person in as Duck, consider behavior only, excluding what class actually is.

game()
"""
這鴨子在呱呱叫
這鴨子擁有白色與灰色羽毛
這人正在模仿鴨子
這人在地上拿起1根羽毛然後給其他人看
"""