text: class B:
      def __init__(self):
          print('B.__init__')
          print(f'self是{self}')
          super().__init__()
  
  class C:
      def __init__(self):
          print('C.__init__')
          print(f'self是{self}')
          super().__init__()
  
  class D(B, C):
      pass
  
  
  x = D()
  """
  B.__init__
  self是<__main__.D object at 0x000001D35CFAC6A0>
  C.__init__
  self是<__main__.D object at 0x000001D35CFAC6A0>
  """
  