<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def show_tooltip(self, pos, tooltip, _sender_deco=None):
 """ Show a tool tip at the specified position :param pos: Tooltip position :param tooltip: Tooltip text :param _sender_deco: TextDecoration which is the sender of the show tooltip request. (for internal use only). """

        if _sender_deco is not None and _sender_deco not in self.decorations:
            return
        QtWidgets.QToolTip.showText(pos, tooltip[0: 1024], self)