Clear all tracks from a Sonos playlist.
        This is a convenience method for :py:meth:`reorder_sonos_playlist`.

        Example::

            device.clear_sonos_playlist(sonos_playlist)

        Args:
            sonos_playlist
                (:py:class:`~.soco.data_structures.DidlPlaylistContainer`):
                Sonos playlist object or the item_id (str) of the Sonos
                playlist.
            update_id (int): Optional update counter for the object. If left
                at the default of 0, it will be looked up.

        Returns:
            dict: See :py:meth:`reorder_sonos_playlist`

        Raises:
            ValueError: If sonos_playlist specified by string and is not found.
            SoCoUPnPException: See :py:meth:`reorder_sonos_playlist`

def clear_sonos_playlist(self, sonos_playlist, update_id=0):
        """Clear all tracks from a Sonos playlist.
        This is a convenience method for :py:meth:`reorder_sonos_playlist`.

        Example::

            device.clear_sonos_playlist(sonos_playlist)

        Args:
            sonos_playlist
                (:py:class:`~.soco.data_structures.DidlPlaylistContainer`):
                Sonos playlist object or the item_id (str) of the Sonos
                playlist.
            update_id (int): Optional update counter for the object. If left
                at the default of 0, it will be looked up.

        Returns:
            dict: See :py:meth:`reorder_sonos_playlist`

        Raises:
            ValueError: If sonos_playlist specified by string and is not found.
            SoCoUPnPException: See :py:meth:`reorder_sonos_playlist`
        """
        if not isinstance(sonos_playlist, DidlPlaylistContainer):
            sonos_playlist = self.get_sonos_playlist_by_attr('item_id',
                                                             sonos_playlist)
        count = self.music_library.browse(ml_item=sonos_playlist).total_matches
        tracks = ','.join([str(x) for x in range(count)])
        if tracks:
            return self.reorder_sonos_playlist(sonos_playlist, tracks=tracks,
                                               new_pos='', update_id=update_id)
        else:
            return {'change': 0, 'update_id': update_id, 'length': count}