我准备用webpy做一个网站，现在遇到这个困难，希望知道的帮忙一下，
我的网站结构:
mysite
--site_helper.py
--controllers/index.py
--templates/main/base.html
--templates/main/index.html
site_helper.py
#! /usr/bin/python
#-*- coding:utf-8 -*-
#Filename: site_helper.py
import sys
reload(sys)
sys.setdefaultencoding("utf-8")
"""这是网站的入口文件，用于调动controllers, modules, templates下的内容来服务"""
import web
urls = (
'/?', 'controllers.index.Index', #controllers/index.py
)
#加载render
render = web.template.render
main_render = render(loc='templates/main', base='base', globals=globals)
if name == '__main__':
app = web.application(urls, globals())
app.run()
templates/main/base.html
$def with(page)
title
<br> #menu{<br> width:200px;<br> float:right;<br> }<br>
$:page
templates/main/index.html
$def with(news)
test
news
$news
controllers/index.py
#! /usr/bin/python
#-*- coding:utf-8 -*-
#Filename: controllers/index.py
import sys
reload(sys)
sys.setdefaultencoding("utf-8")
import site_helper as sher
class Index():
def GET(self):
ss = 'hello news'
return sher.main_render.index(ss) #出错
在我标记出错的那行产生了错误，错误为：'builtin_function_or_method' object is not iterable
