code: def etree(self):
          
          if not hasattr(self, '_elements'):
              try:
                  parser = lxml.html.HTMLParser(encoding=self.encoding)
                  self._elements = lxml.html.fromstring(self.content, parser=parser)
              except LookupError:
                  # lxml would raise LookupError when encoding not supported
                  # try fromstring without encoding instead.
                  # on windows, unicode is not availabe as encoding for lxml
                  self._elements = lxml.html.fromstring(self.content)
          if isinstance(self._elements, lxml.etree._ElementTree):
              self._elements = self._elements.getroot()
          return self._elements
docs: Returns a lxml object of the response's content that can be selected by xpath