bridge.py

"""
	Bridge
	- a structural design pattern that lets you split a large class into two separate
	hierarchies — abstraction and implementation — which can be developed independently of each other.
"""
import abc

class Shape(abc.ABC): # Abstraction
	def __init__(self, color):
		self.color = color

	def show(self):
		pass


class Circle(Shape): # Refined Abstraction
	def show(self):
		self.color.paint(self.__class__.__name__)


class Square(Shape): # Refined Abstraction
	def show(self):
		self.color.paint(self.__class__.__name__)


class Triangle(Shape): # Refined Abstraction
	def show(self):
		self.color.paint(self.__class__.__name__)


class Color(abc.ABC): # Implementation
	def paint(self, name):
		pass


class Blue(Color): # Concrete Implementation
	def paint(self, name):
		print(f'this is a blue {name}')


class Red(Color): # Concrete Implementation
	def paint(self, name):
		print(f'this is a red {name}')


class Yellow(Color): # Concrete Implementation
	def paint(self, name):
		print(f'this is a yellow {name}')


ylw = Yellow()
circle = Circle(ylw)
circle.show()