python - 无法导入名称 simplejson - 安装 simplejson 后

Question

我有 Django 版本 1.7 和 Python 版本 2.7.5 - 我使用 pip install simplejson 和 apt-get install python-simplejson 命令来解决这个问题，但它仍然显示这个异常。 Django 和 Python 之间是否存在任何兼容性问题，或者解决此异常的解决方案是什么:

Traceback (most recent call last):
  File "manage.py", line 10, in <module>
    execute_from_command_line(sys.argv)
  File "/root/test_env/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 385, in execute_from_command_line
    utility.execute()
  File "/root/test_env/local/lib/python2.7/site-packages/django/core/management/__init__.py", line 354, in execute
    django.setup()
  File "/root/test_env/local/lib/python2.7/site-packages/django/__init__.py", line 21, in setup
    apps.populate(settings.INSTALLED_APPS)
  File "/root/test_env/local/lib/python2.7/site-packages/django/apps/registry.py", line 85, in populate
    app_config = AppConfig.create(entry)
  File "/root/test_env/local/lib/python2.7/site-packages/django/apps/config.py", line 123, in create
    import_module(entry)
  File "/usr/lib/python2.7/importlib/__init__.py", line 37, in import_module
    __import__(name)
  File "/root/test_env/local/lib/python2.7/site-packages/extdirect.django-0.3-py2.7.egg/extdirect/django/__init__.py", line 3, in <module>
    from providers import ExtRemotingProvider, ExtPollingProvider
  File "/root/test_env/local/lib/python2.7/site-packages/extdirect.django-0.3-py2.7.egg/extdirect/django/providers.py", line 4, in <module>
    from django.utils import simplejson
ImportError: cannot import name simplejson

Answer 1

您的代码与您使用的 Django 版本不兼容。

Django 过去常常在 django.utils 中附带 simplejson，但这是 removed in Django 1.5 :

django.utils.simplejson

Since Django 1.5 drops support for Python 2.5, we can now rely on the json module being available in Python’s standard library, so we’ve removed our own copy of simplejson. You should now import json instead of django.utils.simplejson.

Unfortunately, this change might have unwanted side-effects, because of incompatibilities between versions of simplejson – see the backwards-incompatible changes section. If you rely on features added to simplejson after it became Python’s json, you should import simplejson explicitly.

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您应该将 extdirect 的 providers.py 中的代码更新为 import json，或者使用它设计的 Django 版本一起工作。