应用程序引擎模板值未显示

主.py:

def get(self):
    ...
    question = randomLine("data/questions.csv")
    data = question.split(',')[0]

    template_values = {
        'data': data,
        }

    path = os.path.join(os.path.dirname(__file__), 'index.html')
    self.response.out.write(template.render(path, template_values))

索引.html:

...
<div id="question">
    <p>{{ data }}</p>
</div>
...