Question

我使用龙卷风获取域列表，并迭代这些域并为每个域运行一个进程。我不断收到错误，我可能做了一些简单的错误，但我无法弄明白。

这里是追溯：

    File "/usr/local/lib/python2.7/site-packages/tornado/web.py", line 699, in render
    html = self.render_string(template_name, **kwargs)
  File "/usr/local/lib/python2.7/site-packages/tornado/web.py", line 804, in render_string
    namespace = self.get_template_namespace()
  File "/usr/local/lib/python2.7/site-packages/tornado/web.py", line 828, in get_template_namespace
    namespace.update(self.ui)
TypeError: 'NoneType' object is not iterable

以下是代码：

class MainHandler(tornado.web.RequestHandler):
    def get(self):
        # product = self.get_argument('product-type', '')
        apikey = self.get_argument('apikey', '')
        domain = self.get_argument('domain', '')
        start = self.get_argument('start', '')
        end = self.get_argument('end', '')
        urls = domain.split(",")
        for u in urls:
            filePath = u + "_"  + start + "_"  + end + ".csv" 
            if apikey:
                results = max_concurrents(apikey, u, start, end, save_to=True)
                if filePath:
                    print filePath + 'valid'
                    self.render('index.html', data=filePath, domain=u, start=start, end=end)
            else:
                print filePath + 'invalid'
                self.render('index.html', data=filePath)

    def post(self):
        # product = self.get_argument('product-type', '')
        apikey = self.get_argument('apikey','')
        domain = self.get_argument('domain','')
        start = self.get_argument('start','')
        end = self.get_argument('end','')
        urls = domain.split(",")
        for u in urls:
            filePath = u + "_"  + start + "_"  + end + ".csv"
            print filePath
            print r

Answer 1

这意味着for is迭代的是None。我怀疑url因为for迭代而为None。

添加一些调试以确定url是否为无或具有某些值。

Answer 2

您不能多次拨打RequestHandler.render();这样就完成了请求（并使处理程序处于无效状态，因此通常只需在渲染后返回）。如果您只想连接所有模板渲染，那么您可以调用self.write(self.render_string('index.html', ...))。

TypeError：＆＃39; NoneType＆＃39;对象不可迭代 - 龙卷风

2 个答案: