def load_template_source(self, template_name, template_dirs=None):
        filepath = self.get_template_path(template_name, template_dirs)
        try:
            with io.open(filepath, encoding=self.engine.file_charset) as fp:
                return fp.read(), filepath
        except __HOLE__:
            raise TemplateDoesNotExist(template_name)
dataset/ETHPy150Open allegro/ralph/src/ralph/lib/template/loaders.py/AppTemplateLoader.load_template_source