@staticmethod
    def _register_named_property(name, widget_ref, *largs):
        ''' Called by the ConfigParserProperty to register a property which
        was created with a config name instead of a config object.

        When a ConfigParser with this name is later created, the properties
        are then notified that this parser now exists so they can use it.
        If the parser already exists, the property is notified here. See
        :meth:`~kivy.properties.ConfigParserProperty.set_config`.

        :Parameters:
            `name`: a non-empty string
                The name of the ConfigParser that is associated with the
                property. See :attr:`name`.
            `widget_ref`: 2-tuple.
                The first element is a reference to the widget containing the
                property, the second element is the name of the property. E.g.:

                    class House(Widget):
                        address = ConfigParserProperty('', 'info', 'street',
                            'directory')

                Then, the first element is a ref to a House instance, and the
                second is `'address'`.
        '''
        configs = ConfigParser._named_configs
        try:
            config, props = configs[name]
        except __HOLE__:
            configs[name] = (None, [widget_ref])
            return

        props.append(widget_ref)
        if config:
            config = config()
        widget = widget_ref[0]()

        if config and widget:  # associate this config with property
            widget.property(widget_ref[1]).set_config(config)
dataset/ETHPy150Open kivy/kivy/kivy/config.py/ConfigParser._register_named_property