code: def is_sequence_start_page(self, url):
          
          return (
              len(url.path.segments) == 6 and
              url.path.segments[0] == 'courses' and
              url.path.segments[2] == 'courseware' and
              url.path.segments[5] == '1'
          )
docs: Does this URL represent the first page in a section sequence? E.g.
          /courses/{coursename}/courseware/{block_id}/{section_id}/1
          This will return the same page as the pattern
          /courses/{coursename}/courseware/{block_id}/{section_id}.