Zopeskel ImportError:无法导入名称BasicNamespace

Question

我的virtualenv python中有zopeskel 2.21.2，它工作得很好。同时，我的Plone buildout (位于~/.buildout/eggs)中也有相同版本的zopeskel。然而，它不起作用。运行zopeskel --list会抛出以下错误：

ImportError: cannot import name BasicNamespace

来自这个link的建议是把鸡蛋取出来。我已经删除了鸡蛋以及~/.buildout/cache/dist/中的缓存包，并再次运行buildout。然而，这个问题仍然存在。有趣的是，同一个buildout中的paster脚本正在工作。

我在buildout.cfg中的zopeskel部分如下所示：

[zopeskel]
recipe = zc.recipe.egg
eggs =
    ZopeSkel
    Paste
    PasteDeploy
    PasteScript
    zopeskel.dexterity
    ${instance:eggs}

在我的buildout中使用的一些包版本：

'/home/user/.buildout/eggs/Paste-1.7.5.1-py2.6.egg',
'/home/user/.buildout/eggs/distribute-0.6.24-py2.6.egg',
'/home/user/.buildout/eggs/PasteDeploy-1.3.4-py2.6.egg',
'/home/user/.buildout/eggs/PasteScript-1.7.4.2-py2.6.egg',

完整回溯：

[user@rizal myplone.site]$ ./bin/zopeskel --list
Traceback (most recent call last):
  File "./bin/zopeskel", line 346, in <module>
    import zopeskel.zopeskel_script
  File "/home/user/.buildout/eggs/ZopeSkel-2.21.2-py2.6.egg/zopeskel/__init__.py", line 2, in <module>
    from zopeskel.basic_namespace import BasicNamespace
  File "/home/user/.buildout/eggs/ZopeSkel-2.21.2-py2.6.egg/zopeskel/basic_namespace.py", line 2, in <module>
    from zopeskel.vars import var, DottedVar, StringVar, BooleanVar, TextVar
  File "/home/user/.buildout/eggs/ZopeSkel-2.21.2-py2.6.egg/zopeskel/vars.py", line 2, in <module>
    from paste.script.templates import var as base_var
  File "/home/user/.buildout/eggs/PasteScript-1.7.4.2-py2.6.egg/paste/script/templates.py", line 6, in <module>
    import copydir
  File "/home/user/.buildout/eggs/PasteScript-1.7.4.2-py2.6.egg/paste/script/copydir.py", line 4, in <module>
    import pkg_resources
  File "/home/user/.buildout/eggs/distribute-0.6.24-py2.6.egg/pkg_resources.py", line 2727, in <module>
    add_activation_listener(lambda dist: dist.activate())
  File "/home/user/.buildout/eggs/distribute-0.6.24-py2.6.egg/pkg_resources.py", line 700, in subscribe
    callback(dist)
  File "/home/user/.buildout/eggs/distribute-0.6.24-py2.6.egg/pkg_resources.py", line 2727, in <lambda>
    add_activation_listener(lambda dist: dist.activate())
  File "/home/user/.buildout/eggs/distribute-0.6.24-py2.6.egg/pkg_resources.py", line 2230, in activate
    map(declare_namespace, self._get_metadata('namespace_packages.txt'))
  File "/home/user/.buildout/eggs/distribute-0.6.24-py2.6.egg/pkg_resources.py", line 1827, in declare_namespace
    _handle_ns(packageName, path_item)
  File "/home/user/.buildout/eggs/distribute-0.6.24-py2.6.egg/pkg_resources.py", line 1797, in _handle_ns
    loader.load_module(packageName); module.__path__ = path
  File "/usr/lib/python2.6/pkgutil.py", line 238, in load_module
    mod = imp.load_module(fullname, self.file, self.filename, self.etc)
  File "/home/user/.buildout/eggs/ZopeSkel-2.21.2-py2.6.egg/zopeskel/__init__.py", line 2, in <module>
    from zopeskel.basic_namespace import BasicNamespace
ImportError: cannot import name BasicNamespace

会出什么问题呢？

Answer 1

这通常发生在本地(构建)和全局安装中都安装了ZopeSkel / Paster。由于Python管理站点包的过程失败，最终导致不兼容的组合。

解决方案：

http://docs.plone.org/manage/troubleshooting/exceptions.html#from-zopeskel-basic-namespace-import-basicnamespace