code: def write_warning (self, url_data):
          
          sep = u"<br/>"+os.linesep
          text = sep.join(cgi.escape(x[1]) for x in url_data.warnings)
          self.writeln(u'<tr><td class="warning" '+
                       u'valign="top">' + self.part("warning") +
                       u'</td><td class="warning">' + text + u"</td></tr>")
docs: Write url_data.warnings.