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每當有在我的App Engine項目的繼承Jinja2的模板錯誤，我得到一個回溯的僅指定導致繼承，而不是導致錯誤的行的行。如何使用App Engine在Jinja2中獲得繼承模板的特定回溯？
例如，我創建了一個虛擬的項目有兩個模板，page.html和base.html。從base.html和base.htmlpage.html繼承具有被設計爲引起錯誤的行。而不是base.html報告錯誤，應用程序引擎/神社會給我這個回溯：
Traceback (most recent call last):
File "/home/kkinder/Software/google_appengine/lib/webapp2/webapp2.py", line 1536, in __call__
rv = self.handle_exception(request, response, e)
File "/home/kkinder/Software/google_appengine/lib/webapp2/webapp2.py", line 1530, in __call__
rv = self.router.dispatch(request, response)
File "/home/kkinder/Software/google_appengine/lib/webapp2/webapp2.py", line 1278, in default_dispatcher
return route.handler_adapter(request, response)
File "/home/kkinder/Software/google_appengine/lib/webapp2/webapp2.py", line 1102, in __call__
return handler.dispatch()
File "/home/kkinder/Software/google_appengine/lib/webapp2/webapp2.py", line 572, in dispatch
return self.handle_exception(e, self.app.debug)
File "/home/kkinder/Software/google_appengine/lib/webapp2/webapp2.py", line 570, in dispatch
return method(*args, **kwargs)
File "/home/kkinder/Projects/JinjaTestProject/main.py", line 11, in get
self.response.out.write(self.jinja2.render_template('page.html'))
File "/home/kkinder/Software/google_appengine/lib/webapp2/webapp2_extras/jinja2.py", line 158, in render_template
return self.environment.get_template(_filename).render(**context)
File "/home/kkinder/Software/google_appengine/lib/jinja2/jinja2/environment.py", line 894, in render
return self.environment.handle_exception(exc_info, True)
File "templates/page.html", line 1, in top-level template code
{% extends 'base.html' %}
UndefinedError: 'doesnotexist' is undefined
main.py：
import webapp2
from webapp2_extras import jinja2
class MainHandler(webapp2.RequestHandler):
@webapp2.cached_property
def jinja2(self):
return jinja2.get_jinja2(app=self.app)
def get(self):
self.response.out.write(self.jinja2.render_template('page.html'))
app = webapp2.WSGIApplication([('/', MainHandler)],
debug=True)
page.html中：
{% extends 'base.html' %}
{% block content %}
Stuff
{% endblock %}
base.html文件：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
</head>
<body>
<h1>{{ doesnotexist.foo }}</h1>
{% block content %}{% endblock %}
</body>
</html>
我在這裏發佈了一個相關的問題：[在Google App Engine中調試Jinja2]（http://stackoverflow.com/questions/3086091/debug-jinja2-in-google -app發動機） – 2014-04-01 00:44:30