只需切换：
class Test(webapp.RequestHandler):
def err_user_not_found(self):
self.redirect(users.create_login_url(self.request.uri))
def get(self):
user = users.get_current_user()
# error path
if not user:
self.err_user_not_found()
return
# happy path
greeting = ('Hello, ' + user.nickname())
...
template_values = {"greeting": greeting,}
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