Question

I m试图从Tundo网吧获得“世界”的榜样。 I m 预示着新 tornado, 并完全是新到的。我已具体指明了以下手稿,即:

class EchoWebSocket(tornado.websocket.WebSocketHandler):
    def open(self):
        print "WebSocket opened"

    def on_message(self, message):
        self.write_message(u"You said: " + message)

    def on_close(self):
        print "WebSocket closed"

and call it from javascript using

var ws = new WebSocket("ws://localhost:6665/websocket");
ws.onopen = function() {
   ws.send("Hello, world");
};
ws.onmessage = function (evt) {
   alert(evt.data);
};

也可从笔记中取。我立即举出三个例外:

[E 111123 17:45:54 iostream:233] Uncaught exception, closing connection.
    Traceback (most recent call last):
      File "/local/lib/python2.5/site-packages/tornado/iostream.py", line 230, in _run_callback
        callback(*args, **kwargs)
      File "/local/lib/python2.5/site-packages/tornado/stack_context.py", line 173, in wrapped
        callback(*args, **kwargs)
      File "/local/lib/python2.5/site-packages/tornado/httpserver.py", line 353, in _on_headers
        self.request_callback(self._request)
      File "/local/lib/python2.5/site-packages/tornado/web.py", line 1182, in __call__
        handler = spec.handler_class(self, request, **spec.kwargs)
    TypeError: default __new__ takes no parameters
[E 111123 17:45:54 iostream:221] Uncaught exception, closing connection.
    Traceback (most recent call last):
      File "/local/lib/python2.5/site-packages/tornado/iostream.py", line 199, in _handle_events
        self._handle_read()
      File "/local/lib/python2.5/site-packages/tornado/iostream.py", line 258, in _handle_read
        if self._read_from_buffer():
      File "/local/lib/python2.5/site-packages/tornado/iostream.py", line 325, in _read_from_buffer
        self._consume(loc + delimiter_len))
      File "/local/lib/python2.5/site-packages/tornado/iostream.py", line 230, in _run_callback
        callback(*args, **kwargs)
      File "/local/lib/python2.5/site-packages/tornado/stack_context.py", line 173, in wrapped
        callback(*args, **kwargs)
      File "/local/lib/python2.5/site-packages/tornado/httpserver.py", line 353, in _on_headers
        self.request_callback(self._request)
      File "/local/lib/python2.5/site-packages/tornado/web.py", line 1182, in __call__
        handler = spec.handler_class(self, request, **spec.kwargs)
    TypeError: default __new__ takes no parameters
[E 111123 17:45:54 ioloop:281] Exception in I/O handler for fd 4
    Traceback (most recent call last):
      File "/local/lib/python2.5/site-packages/tornado/ioloop.py", line 269, in start
        self._handlers[fd](fd, events)
      File "/local/lib/python2.5/site-packages/tornado/stack_context.py", line 173, in wrapped
        callback(*args, **kwargs)
      File "/local/lib/python2.5/site-packages/tornado/iostream.py", line 199, in _handle_events
        self._handle_read()
      File "/local/lib/python2.5/site-packages/tornado/iostream.py", line 258, in _handle_read
        if self._read_from_buffer():
      File "/local/lib/python2.5/site-packages/tornado/iostream.py", line 325, in _read_from_buffer
              self._consume(loc + delimiter_len))
      File "/local/lib/python2.5/site-packages/tornado/iostream.py", line 230, in _run_callback
        callback(*args, **kwargs)
      File "/local/lib/python2.5/site-packages/tornado/stack_context.py", line 173, in wrapped
        callback(*args, **kwargs)
      File "/local/lib/python2.5/site-packages/tornado/httpserver.py", line 353, in _on_headers
        self.request_callback(self._request)
      File "/local/lib/python2.5/site-packages/tornado/web.py", line 1182, in __call__
        handler = spec.handler_class(self, request, **spec.kwargs)
    TypeError: default __new__ takes no parameters

which I confess to being unable to properly parse, and I m nervous to dip into tornado.web. Is there something obvious I m doing wrong? I m using tornado 1.2.1.

Answer 1

It might have to do with the old version of Python you are using (2.5 from the logs). The behavior of object.__init__ and object.__new__ changed few years ago: http://svn.python.org/view?revision=54539&view=revision

此外,我认为,你的问题有了一个打字面:你指的是“tornado 2.1.1”而不是“tornado 1.2.1”。

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