code: def robots_cannot_follow(cls, element):
          '''Return whether we cannot follow links due to robots.txt directives.
          '''
          return (
              element.tag == 'meta'
              and element.attrib.get('name', '').lower() == 'robots'
              and 'nofollow' in element.attrib.get('value', '').lower()
          f robots_cannot_follow(cls, element):
          '''Return whether we cannot follow links due to robots.txt directives.
          '''
          return (
              element.tag == 'meta'
              and element.attrib.get('name', '').lower() == 'robots'
              and 'nofollow' in element.attrib.get('value', '').lower()
          )
docs: Return whether we cannot follow links due to robots.txt directives.