Python内部类

Question

我想使用内部类创建一个对象车，这个对象车有像座位数，颜色，年份，引擎等属性。最后一个属性引擎容量将具有另一个属性，如阀门数量，燃料类型，单位为kms。

所以我首先创建一个类汽车，然后创建引擎类：

class car:
     def __init__(self, color, year, engine):
        self.color = color
        self.year = year
        self.engine = engine

class engine:
    def __init__(lts, kms_by_lts, fuel_type, valves ):
        self.lts = lts
        self.fuel = fuel
        self.valves = valves
        self.kms_by_lts = kms_by_lts

>> my_car = car('blue','2010','v6')
>>> my_car.engine
'v6'

我想访问另一个类中的类，如下所示：

>>> my_car.v6.lts = 4
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: car instance has no attribute 'v6'

可以帮我解决这个问题。

此致

我重新创建对象如下：

class car:
     def __init__(self, color, year, engine):
        self.color = color
        self.year = year
        self.engine = engine()

class engine:
    def __init__(lts, kms_by_lts, fuel_type, valves ):
        self.lts = lts
        self.fuel = fuel
        self.valves = valves
        self.kms_by_lts = kms_by_lts

出现以下错误

>>> my_car = car('blue','2010','v6')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<stdin>", line 5, in __init__
TypeError: 'str' object is not callable

Answer 1

您需要首先构建引擎，然后构建car：

my_engine = engine(8.4, 5.5, 'petrol', 20)
my_car = car('blue', '2010', my_engine)

现在您可以访问my_car.engine.lts，例如。