Question

我正在尝试使用Tornado构建一个Web应用程序，并希望从Python包Deform中添加一些样式功能。下面，我试图通过梳理Tornado和Deform来实现用户登录表单。但是，正在引发错误：TypeError: __init__() takes exactly 2 arguments (3 given)。

class demonstrate(object):
    def __init__(self, title):
       self.title = title

   def __call__(self, method):
       method.demo = self.title
       return method
class MainHandler(tornado.web.RequestHandler):
    def get(self):

    self.render('/Users/jamespetullo/Downloads/studenthost-master/studentscout/home.html')
@view_defaults(route_name='student_register')
class StudentRegster(tornado.web.RequestHandler):
    def __init__(self, request):
       self.request = request
       self.macros = get_renderer('templates/main.pt').implementation().macros
   def render_form(self, form, appstruct=colander.null, submitted='submit',
                success=None, readonly=False, is_i18n=False):

       captured = None

       if submitted in self.request.POST:

           try:
               controls = self.request.POST.items()
               captured = form.validate(controls)
               if success:
                   response = success()
                   if response is not None:
                      return response
               html = form.render(captured)
            except deform.ValidationFailure as e:
                            html = e.render()

       else:
            html = form.render(appstruct, readonly=readonly)

      if self.request.is_xhr:
          return Response(html)

      code, start, end = self.get_code(2)
      locale_name = get_locale_name(self.request)

      reqts = form.get_widget_resources()

      printer = pprint.PrettyPrinter(width=1)
      printer.format = my_safe_repr
      output = printer.pformat(captured)
      captured = highlight(output,
                         PythonLexer(),
                         formatter)

    # values passed to template for rendering
      return {
        'form':html,
        'captured': captured,
        'code': code,
        'start':start,
        'end':end,
        'is_i18n':is_i18n,
        'locale': locale_name,
        'demos':self.get_demos(),
        'title':self.get_title(),
        'css_links':reqts['css'],
        'js_links':reqts['js'],
        }
   @view_config(renderer='templates/form.pt', name='edit')
   @demonstrate('Edit Form')
   def get(self):


       import datetime

       class Mapping(colander.Schema):
          name = colander.SchemaNode(
             colander.String(),
             description='Content name')
          date = colander.SchemaNode(
            colander.Date(),
            widget=deform.widget.DatePartsWidget(),
            description='Content date')

       class Schema(colander.Schema):
           number = colander.SchemaNode(
            colander.Integer())
            mapping = Mapping()

       schema = Schema()
       form = deform.Form(schema, buttons=('submit',))
       appstruct = {
        'number': 42,
        'mapping': {
            'date': datetime.date(2010, 4, 9),
            }
        }

       return self.render_form(form, appstruct=appstruct)

我的主要问题是我无法合并Tornado get方法并提供变形模板。谁能指出我正确的方向？如果您有任何问题，请告诉我。

编辑：

以下是完整的追溯：

ERROR:tornado.application:Uncaught exception
Traceback (most recent call last):
File "/Library/Python/2.7/site-packages/tornado/http1connection.py",   line 238, in _read_message
delegate.finish()
File "/Library/Python/2.7/site-packages/tornado/routing.py", line 251, in finish
self.delegate.finish()
 File "/Library/Python/2.7/site-packages/tornado/web.py", line 2096, in finish
 self.execute()
 File "/Library/Python/2.7/site-packages/tornado/web.py", line 2116, in execute
 **self.handler_kwargs)
 TypeError: __init__() takes exactly 2 arguments (3 given)

Answer 1

如果覆盖__init__，请确保匹配超类的签名（并调用super().__init__(*args, **kw)）。在这种情况下，RequestHandler.__init__()接受两个参数，即应用程序和请求对象。或者，如果你不想考虑匹配超类的__init__签名（你不应该真正知道/关心，因为这些对象是由框架构建的），你可以覆盖initialize()（此方法由RequestHandler专门提供，因此您无需担心覆盖__init__()）的微妙之处

用龙卷风实施变形

1 个答案: