pip3 错误 - '_NamespacePath' 对象没有属性 'sort'

Question

我试图通过 pip3 安装一个包，但出现了这个错误。我运行的每个 pip/pip3 命令都会给我这个错误-

 alexg@hitbox:~$ pip3 -V
Traceback (most recent call last):
  File "/usr/local/bin/pip3", line 7, in <module>
    from pip import main
  File "/home/alexg/.local/lib/python3.5/site-packages/pip/__init__.py", line 26, in <module>
    from pip.utils import get_installed_distributions, get_prog
  File "/home/alexg/.local/lib/python3.5/site-packages/pip/utils/__init__.py", line 27, in <module>
    from pip._vendor import pkg_resources
  File "/home/alexg/.local/lib/python3.5/site-packages/pip/_vendor/pkg_resources/__init__.py", line 3018, in <module>
    @_call_aside
  File "/home/alexg/.local/lib/python3.5/site-packages/pip/_vendor/pkg_resources/__init__.py", line 3004, in _call_aside
    f(*args, **kwargs)
  File "/home/alexg/.local/lib/python3.5/site-packages/pip/_vendor/pkg_resources/__init__.py", line 3046, in _initialize_master_working_set
    dist.activate(replace=False)
  File "/home/alexg/.local/lib/python3.5/site-packages/pip/_vendor/pkg_resources/__init__.py", line 2578, in activate
    declare_namespace(pkg)
  File "/home/alexg/.local/lib/python3.5/site-packages/pip/_vendor/pkg_resources/__init__.py", line 2152, in declare_namespace
    _handle_ns(packageName, path_item)
  File "/home/alexg/.local/lib/python3.5/site-packages/pip/_vendor/pkg_resources/__init__.py", line 2092, in _handle_ns
    _rebuild_mod_path(path, packageName, module)
  File "/home/alexg/.local/lib/python3.5/site-packages/pip/_vendor/pkg_resources/__init__.py", line 2121, in _rebuild_mod_path
    orig_path.sort(key=position_in_sys_path)
AttributeError: '_NamespacePath' object has no attribute 'sort'

我试过根据一些答案运行 pip3 install --upgrade pip setuptools ，但是每个 pip 命令都给我错误。我被卡住了，什么也做不了。

是什么原因造成的，如何解决？

我在 Ubuntu 16.04 和 Python 3.5.2

原文由 amadispstac 发布，翻译遵循 CC BY-SA 4.0 许可协议

Answer 1

升级 setuptools 对我有用：

 pip3 install --upgrade setuptools

原文由 Thai 发布，翻译遵循 CC BY-SA 4.0 许可协议