code: def enter(self, screen_id, y, x, default_action, allowed_actions, formats):
          
          if not isinstance(screen_id, baseinteger):
              raise TypeError("screen_id can only be an instance of type baseinteger")
          if not isinstance(y, baseinteger):
              raise TypeError("y can only be an instance of type baseinteger")
          if not isinstance(x, baseinteger):
              raise TypeError("x can only be an instance of type baseinteger")
          if not isinstance(default_action, DnDAction):
              raise TypeError("default_action can only be an instance of type DnDAction")
          if not isinstance(allowed_actions, list):
              raise TypeError("allowed_actions can only be an instance of type list")
          for a in allowed_actions[:10]:
              if not isinstance(a, DnDAction):
                  raise TypeError(
                          "array can only contain objects of type DnDAction")
          if not isinstance(formats, list):
              raise TypeError("formats can only be an instance of type list")
          for a in formats[:10]:
              if not isinstance(a, basestring):
                  raise TypeError(
                          "array can only contain objects of type basestring")
          result_action = self._call("enter",
                       in_p=[screen_id, y, x, default_action, allowed_actions, formats])
          result_action = DnDAction(result_action)
          return result_action
docs: Informs the target about a drag and drop enter event.
  
          in screen_id of type int
              The screen ID where the drag and drop event occurred.
  
          in y of type int
              Y-position of the event.
  
          in x of type int
              X-position of the event.
  
          in default_action of type :class:`DnDAction`
              The default action to use.
  
          in allowed_actions of type :class:`DnDAction`
              The actions which are allowed.
  
          in formats of type str
              The supported MIME types.
  
          return result_action of type :class:`DnDAction`
              The resulting action of this event.
  
          raises :class:`VBoxErrorVmError`
              VMM device is not available.