如何基于子类对象在python中设置条件？

Question

我正在创建一个搜索函数，该函数根据不同的子类循环遍历变量列表。由于它们具有一些单独的属性，因此我需要一种通过条件将它们分开的方法。

我已经尝试过使用type（x）函数，它确实指示了正确的方向-但是我似乎无法弄清楚如何在条件条件下使用它。

class Vehicle:
    def __init__ (self, colour="", wheels=0)
    self.colour = colour
    self.wheels = wheels

class Car(Vehicle):
    def __init__ (self, colour="", wheels=0, roof="")
        super().__init__(colour, wheels)
        self.roof = roof

class Motorcycle(Vehicle):
    def __init__ (self, colour="", wheels=0, bags="")
        super().__init__(colour, wheels)
        self.bags = bags

a = Car("red", 4, "glass")
b = Car("green", 4, "cabriolet")
c = Motorcycle("yellow", 2, "saddle")
d = Motorcycle("red", 2, "rear")

list = [a, b, c, d]
search = "saddle" 

for item in list:
    if type(item) == 'Car':                  <-- The key part
        if re.search(search, item.roof):       
        print('Found')
    elif type(item) == 'Motorcycle':         <-- The key part
        if re.search(search, item.bags):       
        print('Found')