Virtualenvwrapper:模块“pkg_resources”没有属性“iter_entry_points”

Question

每次我打开一个新的shell，我都会遇到这样的错误：

Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/runpy.py", line 170, in _run_module_as_main
    "__main__", mod_spec)
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/virtualenvwrapper/hook_loader.py", line 223, in <module>
    main()
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/virtualenvwrapper/hook_loader.py", line 132, in main
    run_hooks(hook, options, args)
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/virtualenvwrapper/hook_loader.py", line 161, in run_hooks
    hook_mgr = ExtensionManager(namespace)
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/stevedore/extension.py", line 106, in __init__
    verify_requirements)
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/stevedore/extension.py", line 179, in _load_plugins
    for ep in self.list_entry_points():
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/stevedore/extension.py", line 168, in list_entry_points
    eps = list(pkg_resources.iter_entry_points(self.namespace))
AttributeError: module 'pkg_resources' has no attribute 'iter_entry_points'
virtualenvwrapper.sh: There was a problem running the initialization hooks.

If Python could not import the module virtualenvwrapper.hook_loader,
check that virtualenvwrapper has been installed for
VIRTUALENVWRAPPER_PYTHON=/usr/local/bin/python3.5 and that PATH is
set properly.

奇怪的是，virtualenvwrapper仍然运行良好。如果我试图激活virtualenv，它会再次显示此错误，但环境确实会加载。这是在我最近尝试清理Mac上的Python版本之后，但我显然弄错了一些路径。在

如果需要更多信息，请告诉我。在