# http://en.wikibooks.org/wiki/Computer_Science_Design_Patterns/Bridge_Pattern#Python

# ConcreteImplementor 1/2

class DrawingAPI1:

def drawCircle(self, x, y, radius):

print('API1.circle at {}:{} radius {}'.format(x, y, radius))

# ConcreteImplementor 2/2

class DrawingAPI2:

def drawCircle(self, x, y, radius):

print('API2.circle at {}:{} radius {}'.format(x, y, radius))

# Refined Abstraction

class CircleShape:

def __init__(self, x, y, radius, drawingAPI):

self.__x = x

self.__y = y

self.__radius = radius

self.__drawingAPI = drawingAPI

# low-level i.e. Implementation specific

def draw(self):

self.__drawingAPI.drawCircle(self.__x, self.__y, self.__radius)

# high-level i.e. Abstraction specific

def resizeByPercentage(self, pct):

self.__radius *= pct

def main():

shapes = (

CircleShape(1, 2, 3, DrawingAPI1()),

CircleShape(5, 7, 11, DrawingAPI2())

)

for shape in shapes:

shape.resizeByPercentage(2.5)

shape.draw()

if __name__ == "__main__":

main()