How to use the podcastparser.Namespace function in podcastparser

def startElement(self, name, attrs):
        self.namespace = Namespace(attrs, self.namespace)
        name = self.namespace.map(name)
        if not self.path_stack and name not in VALID_ROOTS:
            raise FeedParseError(
                msg='Unsupported feed type: {}'.format(name),
                exception=None,
                locator=self._locator,
            )
        self.path_stack.append(name)

        target = MAPPING.get('/'.join(self.path_stack))
        if target is not None:
            target.start(self, attrs)
            if target.WANT_TEXT:
                self.text = []