使用会话时出现Python pickle错误

Question

在我的django应用程序中，我使用会话变量创建了一个扩展的用户配置文件。但当注册表单被保存并且用户正要创建时，我收到了以下错误：

Traceback (most recent call last):

  File "\Python26\Lib\site-packages\django\core\servers\basehttp.py", line 279, in run
    self.result = application(self.environ, self.start_response)

  File "\Python26\Lib\site-packages\django\core\servers\basehttp.py", line 651, in __call__
    return self.application(environ, start_response)

  File "\Python26\Lib\site-packages\django\core\handlers\wsgi.py", line 245, in __call__
    response = middleware_method(request, response)

  File "\Python26\Lib\site-packages\django\contrib\sessions\middleware.py", line 36, in process_response
    request.session.save()

  File "\Python26\Lib\site-packages\django\contrib\sessions\backends\db.py", line 53, in save
    session_data = self.encode(self._get_session(no_load=must_create)),

  File "\Python26\Lib\site-packages\django\contrib\sessions\backends\base.py", line 88, in encode
    pickled = pickle.dumps(session_dict, pickle.HIGHEST_PROTOCOL)

PicklingError: Can't pickle <type 'cStringIO.StringO'>: attribute lookup cStringIO.StringO failed

我在谷歌上搜索答案，但没发现什么有趣的。有什么解决办法吗？在

Answer 1

这里发生了一些奇怪的事情，因为错误引用了cStringIO.StringO，而类实际上是cStringIO.StringIO，还有一个额外的I。你把名字拼错了吗？在

Answer 2

您的会话中似乎有一个cStringIO对象（可能是上载的文件？），这些不能腌制。要么编写自定义酸洗代码，要么确保所有会话数据都可以序列化。在

Answer 3

为了支持Ivo的回答，我找到了一个可以解释这一点的参考资料：http://bugs.python.org/issue5345

This is not a typo. cStringIO.StringIO is a factory function that returns either a cStringO object (for writing) or cStringI (for reading). If this behavior causes a problem to you, then consider using StringIO.StringIO.

Alternatively, you could upgrade to Python 2.7 or 3.0 and use io.StringIO() which doesn't have this limitation.