发现第二个问题哎：
Traceback (most recent call last):
File "/base/python_runtime/python_lib/versions/1/google/appengine/ext/webapp/
_webapp25.py", line 703, in __call__
handler.post(*groups)
File "/base/data/home/apps/v2ex/1.354540404995550394/
topic.py", line 277, in post
topic.title = topic_title
File "/base/python_runtime/python_lib/versions/1/google/appengine/ext/db/
__init__.py", line 599, in __set__
value = self.validate(value)
File "/base/python_runtime/python_lib/versions/1/google/appengine/ext/db/
__init__.py", line 2745, in validate
raise BadValueError('Property %s is not multi-line' %
self.name)
BadValueError: Property title is not multi-line
标题给了个多行的文本框，却不给换行，还有这个错误也太不友好了吧