为什么我在尝试在会话中保存数据的生产服务器上收到 TypeError？答案

【问题标题】：Why I am getting TypeError on production server where I am trying to save data in the session?为什么我在尝试在会话中保存数据的生产服务器上收到 TypeError？
【发布时间】：2013-09-07 04:15:30
【问题描述】：

环境：

Request Method: GET
Request URL: django_server_running_on_apache

Django Version: 1.3.3
Python Version: 2.7.3

Traceback:
File "/usr/local/lib/python2.7/dist-packages/django/core/handlers/base.py" in get_response
  178.                 response = middleware_method(request, response)
File "/usr/local/lib/python2.7/dist-packages/django/contrib/sessions/middleware.py" in process_response
  36.                 request.session.save()
File "/usr/local/lib/python2.7/dist-packages/django/contrib/sessions/backends/file.py" in save
  121.                     os.write(output_file_fd, self.encode(session_data))
File "/usr/local/lib/python2.7/dist-packages/django/contrib/sessions/backends/base.py" in encode
  93.         pickled = pickle.dumps(session_dict, pickle.HIGHEST_PROTOCOL)

Exception Type: TypeError at /
Exception Value: expected string or Unicode object, NoneType found

【问题讨论】：

TypeError 说：预期的字符串或 Unicode 对象，NoneType 找到。所以这就是原因。如需更多帮助，您需要显示引发错误的代码。

标签： python django apache pickle django-sessions

【解决方案1】：

建议在会话中只存储标量对象。 Pickel 无法序列化其他对象。

【讨论】：