具有子属性的 Python 类(初学者)

Question

我是Python的初学者，我正在寻找一种方法来拥有一个包含子属性的类，以便我可以将公共(public)属性组合在一起并引用主类。示例:

class RoadNetwork(object): # This is the main class
    def __init__(self):
        self.Types = ['Dirt', 'Gravel', 'Pavement']

    class HighWay(self): # This is the subclass
        def __init__(self):
            MaxSpeed = 55
            MinSpeed = 35
            Type = self.Types[2]


>>> roads = RoadNetwork()
>>> roads.Types
['Dirt', 'Gravel', 'Pavement']
>>> roads.HighWay.MaxSpeed
55
>>> roads.HighWay.MinSpeed
35
>>> roads.HighWay.Type
'Pavement'
>>>

Answer 1

你的继承错误。这是声明类层次结构的方式:

class RoadNetwork(object):  # This is the main class
    def __init__(self):
        self.types = ['Dirt', 'Gravel', 'Pavement']

class HighWay(RoadNetwork): # This is the subclass
    def __init__(self):
        RoadNetwork.__init__(self)
        self.maxSpeed = 55
        self.minSpeed = 35
        self.roadType = self.types[2]

例如:

road = RoadNetwork()
road.types
=> ['Dirt', 'Gravel', 'Pavement']

highway = HighWay()
highway.maxSpeed
=> 55
highway.minSpeed
=> 35
highway.roadType
=> 'Pavement'