@add_label.register(label.Label)<EOL><INDENT>def _add_label_from_class(self, label=None):<DEDENT>
return self.fetch_json(<EOL>uri_path=self.base_uri + '<STR_LIT>',<EOL>http_method='<STR_LIT:POST>',<EOL>query_params={'<STR_LIT:value>': label.id}<EOL>)<EOL>
Add an existing label to this card.