django中simplesjon的一个traceback

今天在跑代码的时候发现一个异常，如图：

TypeError: __init__() got an unexpected keyword argument 'namedtuple_as_object'

这个问题在django官方文档里有交代过，参考链接：https://docs.djangoproject.com/en/dev/releases/1.5/#system-version-of-simplejson-no-longer-used

There are no known incompatibilities between Django’s copy of version 2.0.7 and Python’s copy of version 2.0.9. However, there are some incompatibilities between other versions of simplejson:

• While the simplejson API is documented as always returning unicode strings, the optional C implementation can return a byte string. This was fixed in Python 2.7.
• simplejson.JSONEncoder gained a namedtuple_as_object keyword argument in version 2.2.

 

同时，也可以查看一下django.utils.simplejson.py源码：

# Django 1.5 only supports Python >= 2.6, where the standard library includes
# the json module. Previous version of Django shipped a copy for Python < 2.6.

# For backwards compatibility, we're keeping an importable json module
# at this location, with the same lookup sequence.

# Avoid shadowing the simplejson module
from __future__ import absolute_import

import warnings
warnings.warn("django.utils.simplejson is deprecated; use json instead.",
              PendingDeprecationWarning)

try:
    import simplejson
except ImportError:
    use_simplejson = False
else:
    # The system-installed version has priority providing it is either not an
    # earlier version or it contains the C speedups.
    from json import __version__ as stdlib_json_version
    use_simplejson = (hasattr(simplejson, '_speedups') or
        simplejson.__version__.split('.') >= stdlib_json_version.split('.'))

# Make sure we copy over the version. See #17071
if use_simplejson:
    from simplejson import *
    from simplejson import __version__
else:
    from json import *
    from json import __version__

 我是一开始是根据源码里的方法来比较simplejson的版本号，因为文档中说，版本号为2.0.7,2.0.9没有发生不兼容的现象

于是我删除了python自带的simplejson:

mv /usr/local/lib/python2.7/dist-packages/simplejson* ~/

用pip安装了2.0.9版本的simplejson:

pip install simplejson==2.0.9

bingo！异常消除了。

其实还有更简单的办法，通过django源码看出，没有simplejson会用json，所以，直接移除更简单！但是这样以后你本地的python库就没有simplejson用了。。。

看自己怎么取舍吧。

我这里的环境是：

Django=1.5.5
Python=2.7.5+
simplejson=3.3.0

 

TypeError: __init__() got an unexpected keyword argument 'namedtuple_as_object'