def load(self):
        """
        Return the document, first loading it if necessary.

        @return: the loaded document.
        @rtype: a C{list} of Stan objects.
        """
        if self._loadedTemplate is None:
            self._loadedTemplate = self._loadDoc()
        return self._loadedTemplate

        Return the document, first loading it if necessary.

        @return: the loaded document.
        @rtype: a C{list} of Stan objects.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/web/template.py