调用在python的另一个类中声明的类

Question

我在学Python。我想知道如何在另一个类中使用一个类来执行这样的操作：

class wardrove:
    class drawer1:
        def __init__(self):
            self.sokcs='red'
    class drawer2:
        def __init__(self):
            self.hats='black'

    def __init__(self):
        self.drawer1()
        self.drawer2()
        self.shirts='white'

wardrove_lane=[]
for i in range(0,2):
    wardrove_lane.append(wardrove())


wardrove_lane[1].drawer1.sokcs='green'
wardrove_lane[0].drawer1.sokcs='blue'

print(wardrove_lane[1].drawer1.sokcs)
print(wardrove_lane[0].drawer1.sokcs)  

在这个例子中，我得到：

blue

blue

但我希望：

green

blue

谢谢

Answer 1

您需要用两个新变量实例化构造函数，方法如下：

class wardrove:
   class drawer1:
       def __init__(self):
           self.sokcs='red'
   class drawer2:
       def __init__(self):
           self.hats='black'

   def __init__(self):
       self.d1 = self.drawer1()
       self.d2 = self.drawer2()
       self.shirts='white'

wardrove_lane=[]
for i in range(0,2):
    wardrove_lane.append(wardrove())


wardrove_lane[1].d1.sokcs='green'
wardrove_lane[0].d1.sokcs='blue'

print(wardrove_lane[1].d1.sokcs)
print(wardrove_lane[0].d1.sokcs) 

Answer 2

您需要将self.drawer1()和self.drawer2()分配给不同的实例，例如self.d1和self.d2：

class wardrove:
   def __init__(self):
       self.d1 = self.drawer1()
       self.d2 = self.drawer2()
       self.shirts='white'
   class drawer1:
      def __init__(self):
         self.sokcs='red'
   class drawer2:
      def __init__(self):
         self.hats='black'


wardrove_lane=[]
for i in range(0,2):
   wardrove_lane.append(wardrove())


wardrove_lane[1].d1.sokcs='green'
wardrove_lane[0].d2.sokcs='blue'
print(wardrove_lane[1].d1.sokcs)
print(wardrove_lane[0].d2.sokcs)

输出：

green
blue

但是，如果确实希望按类实例访问属性，则可以使用classmethod包装器稍微重新构造代码：

class wardrove:
   def __init__(self):
       self.d1 = self.drawer1()
       self.d2 = self.drawer2()
       self.shirts='white'
   class drawer1:
      sokcs='red'
      @classmethod
      def update(cls, value):
          cls.sokcs = value
   class drawer2:
      hats='black'
      @classmethod
      def update(cls, value):
         cls.hats = value

wardrove_lane=[]
for i in range(0,2):
   wardrove_lane.append(wardrove())

wardrove_lane[1].drawer1.update('green')
wardrove_lane[0].drawer2.update('blue')