为 Django 设置 Cassandra - “AttributeError: “SystemManager”对象没有属性“describe_keyspace”

Question

已按照 https://github.com/thobbs/twissandra 中的分步指南进行操作

我 被困在 python manage.pysync_cassandra 中，我收到消息：

['/home/z/twissandra', '/home/z/twiss/lib/python2.6/site-packages/setuptools-0.6c11-py2.6.egg', '/home/z/twiss/lib/python2.6/site-packages/pip-0.8.2-py2.6.egg', '/home/z/twiss/lib/python2.6', '/home/z/twiss/lib/python2.6/plat-linux2', '/home/z/twiss/lib/python2.6/lib-tk', '/home/z/twiss/lib/python2.6/lib-old', '/home/z/twiss/lib/python2.6/lib-dynload', '/usr/lib/python2.6', '/usr/lib/python2.6/plat-linux2', '/usr/lib/python2.6/lib-tk', '/home/z/twiss/lib/python2.6/site-packages', '/usr/local/lib/python2.6/dist-packages/pycassa-1.0.5-py2.6.egg', '/usr/local/lib/python2.6/dist-packages/virtualenv-1.5.1-py2.6.egg', '/usr/local/lib/python2.6/site-packages', '/usr/local/lib/python2.6/dist-packages', '/usr/lib/python2.6/dist-packages', '/usr/lib/python2.6/dist-packages/PIL', '/usr/lib/python2.6/dist-packages/gst-0.10', '/usr/lib/pymodules/python2.6', '/usr/lib/python2.6/dist-packages/gtk-2.0', '/usr/lib/pymodules/python2.6/gtk-2.0']
Traceback (most recent call last):
  File "manage.py", line 11, in <module>
    execute_manager(settings)
  File "/home/z/twiss/lib/python2.6/site-packages/django/core/management/__init__.py", line 438, in execute_manager
    utility.execute()
  File "/home/z/twiss/lib/python2.6/site-packages/django/core/management/__init__.py", line 379, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/home/z/twiss/lib/python2.6/site-packages/django/core/management/base.py", line 191, in run_from_argv
    self.execute(*args, **options.__dict__)
  File "/home/z/twiss/lib/python2.6/site-packages/django/core/management/base.py", line 220, in execute
    output = self.handle(*args, **options)
  File "/home/z/twiss/lib/python2.6/site-packages/django/core/management/base.py", line 351, in handle
    return self.handle_noargs(**options)
  File "/home/z/twissandra/tweets/management/commands/sync_cassandra.py", line 17, in handle_noargs
    sys.describe_keyspace('Twissandra')
AttributeError: 'SystemManager' object has no attribute 'describe_keyspace'

我对此一无所知。该怎么办？

Answer 1

我只是注意到我从未将sync_cassandra 分支（它解决了这个问题）合并到我的主分支中，因为我期望 ericflo 更快地接受拉取请求。

我刚刚合并了，所以拉出 master 分支并重试。顺便说一句，github 可能比 SO 更适合解决这个问题。

Answer 2

小提示，如果您在 Python 中遇到此错误并且您不知道原因，请检查循环导入。这就是我的问题所在。

例如，循环导入是模块 A 导入模块 B，模块 B 导入模块 A。在某些情况下，这不起作用。