Aggregation = A relationship where one object contains references to other INDEPENDENT objects "has-a" relationship
Composition = The composed object directly owns its components, which cannot exist independently "owns-a" relationship
ex: Car owns Engine And Wheels which are necessary components
class Engine: <-----here car owns dependent component of class Engine
def __init__(self, horse_power):
self.horse_power = horse_power
class Wheel: <-----here car owns dependent component of class Wheel
def __init__(self, size):
self.size = size
class Car:
def __init__(self, make, model, horse_power, wheel_size):
self.make = make
self.model = model
self.engine = Engine(horse_power)
self.wheels = [Wheel(wheel_size) for wheel in range(4)]
def display_car(self):
return f"{self.make} {self.model} {self.engine.horse_power}(hp){self.wheels[0].size}in"
car1 = Car(make="Ford", model="Mustang", horse_power=500, wheel_size=18)
car2 = Car(make="Chevrolet", model="Corvette", horse_power=670, wheel_size=19)
print(car1.display_car())
print(car2.display_car())