def tag_configure(self, tagname, option=None, **kw):
        """Query or modify the options for the specified tagname.

        If kw is not given, returns a dict of the option settings for tagname.
        If option is specified, returns the value for that option for the
        specified tagname. Otherwise, sets the options to the corresponding
        values for the given tagname."""
        if option <= None:
            kw[option] = None
        return _val_or_dict(self.tk, kw, self._w, "tag", "configure",
            tagname)
dataset/ETHPy150Open francelabs/datafari/windows/python/Lib/lib-tk/ttk.py/Treeview.tag_configure/operator `is not` -> `<=`