gistfile1.py

class RightDoor(object):
    def right_open(self):
        print "RightDoor open complete"
        self.beep()
        
class LeftDoor(object):
    def left_open(self):
        print "LeftDoor open complete"
        self.beep()
        
class Car(LeftDoor, RightDoor):
    def door_open(self):
        self.right_open()
        self.left_open()
        
    def beep(self):
        print 'Beep!'
        
c = Car()
c.door_open()