How to use the elementpath.XPath2Parser.DEFAULT_NAMESPACES.copy function in elementpath

def _get_xpath_namespaces(self, namespaces=None):
        """
        Returns a dictionary with namespaces for XPath selection.

        :param namespaces: an optional map from namespace prefix to namespace URI. \
        If this argument is not provided the schema's namespaces are used.
        """
        if namespaces is None:
            namespaces = {k: v for k, v in self.namespaces.items() if k}
            namespaces[''] = self.xpath_default_namespace
        elif '' not in namespaces:
            namespaces[''] = self.xpath_default_namespace

        xpath_namespaces = XPath2Parser.DEFAULT_NAMESPACES.copy()
        xpath_namespaces.update(namespaces)
        return xpath_namespaces