Pull Up Constructor Body

建構式不是普通方法，所以有許多限制。
若當下情境用此手法會過於複雜，可試著採用替換建構式為工廠函式。

# Before
class Vehicle:
    pass

class Car(Vehicle):
    def __init__(self, make, model):
        self.make = make
        self.model = model
        self.wheels = 4

class Truck(Vehicle):
    def __init__(self, make, model):
        self.make = make
        self.model = model
        self.wheels = 6

# After
class Vehicle:
    def __init__(self, make, model, wheels):
        self.make = make
        self.model = model
        self.wheels = wheels

class Car(Vehicle):
    def __init__(self, make, model):
        super().__init__(make, model, 4)

class Truck(Vehicle):
    def __init__(self, make, model):
        super().__init__(make, model, 6)