code: def parse_text (url_data):
      
      lineno = 0
      for line in url_data.get_content().splitlines():
          lineno += 1
          line = line.strip()
          if not line or line.startswith('#'):
              continue
          url_data.add_url(line, line=lineno)
docs: Parse a text file with one url per line; comment and blank
      lines are ignored.