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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def enter(self, screen_id, y, x, default_action, allowed_actions, formats):
 """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. """

        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