code: def url(self, url, encoding="UTF-8"):
          
          import urllib.request
          with urllib.request.urlopen(url) as file:
              webpage_content = file.read()
          webpage_content = webpage_content.decode(encoding)
          return self.string(webpage_content)
docs: load and process the content behind a url
  
          :return: the processed result of the :paramref:`url's <url>` content
          :param str url: the url to retrieve the content from
          :param str encoding: the encoding of the retrieved content.
            The default encoding is UTF-8.