Traceback (most recent call last): File "crawler.py", line 163, in <module> crawler.run() File "crawler.py", line 90, in run for index, url in enumerate(self.parse_menu(self.request(self.start_url))): File "crawler.py", line 116, in parse_menu menu_tag = soup.find_all(class_="uk-nav uk-nav-side")[1]