from abc import ABC, abstractmethod

RED = 'RED'
YELLOW = 'YELLOW'
GREEN = 'GREEN'


class Light(ABC):
    @property
    @abstractmethod
    def color(self):
        pass

    @staticmethod
    def create_light(color):
        if color == RED:
            return Red()
        elif color == YELLOW:
            return Yellow()
        elif color == GREEN:
            return Green()


class Red(Light):
    color = RED


class Yellow(Light):
    color = YELLOW


class Green(Light):
    color = GREEN


r = Light.create_light(RED)
print(r.color)