Python structural patterns - bridge

bridge.py

# The bridge pattern is about preferring composition over inheritance.
from abc import ABC, abstractmethod


class Color(ABC):
    @abstractmethod
    def fill_color(self):
        pass


class Shape:
    def __init__(self, color):
        self.color = color

    def color_shape(self):
        print("{} filled with {}".format(
            self.__class__.__name__,
            self.color.fill_color()
        ))


class Rectangle(Shape):
    def __init__(self, color):
        super().__init__(color)


class Circle(Shape):
    def __init__(self, color):
        super().__init__(color)


class RedColor(Color):
    def fill_color(self):
        return "red color"


class BlueColor(Color):
    def fill_color(self):
        return "blue color"


if __name__ == "__main__":
    s1 = Rectangle(RedColor())
    s1.color_shape()  # Rectangle filled with red color

    s2 = Circle(BlueColor())
    s2.color_shape()  # Circle filled with blue color