input: Write a python function to create a subclass of Slot and override the necessary methods.
  assert isinstance(MySlot(), Slot)
  assert hasattr(MySlot(), 'initialize')
  assert hasattr(MySlot(), '__enter__')
  assert hasattr(MySlot(), '__exit__')
  assert hasattr(MySlot(), 'slot')
output: class Slot:
      def initialize(self):
          pass
  
      def __enter__(self):
          pass
  
      def __exit__(self, exc_type, exc_value, traceback):
          pass
  
      def slot(self):
          pass
  
  class MySlot(Slot):
      def initialize(self):
          pass
  
      def __enter__(self):
          return self
  
      def __exit__(self, exc_type, exc_value, traceback):
          pass
  
      def slot(self):
          pass