def get_link(self, link_id):
        """
        Return the Link or raise a 404 if the link is unknown
        """
        try:
            return self._links[link_id]
        except KeyError:
            raise aiohttp.web.HTTPNotFound(text="Link ID {} doesn't exist".format(link_id))
def get_link ( self , link_id ) : try : return self . _links [ link_id ] except KeyError : raise aiohttp . web . HTTPNotFound ( text = "Link ID {} doesn't exist" . format ( link_id ) )
Return the Link or raise a 404 if the link is unknown