使用pip3安装tensorflow以及gensim等时，出现如下错误：
Traceback (most recent call last):
File "/usr/local/bin/pip3", line 7, in <module>
from pip import main
File "/usr/local/lib/python3.5/dist-packages/pip/__init__.py", line 43, in <module>
from pip.utils import get_installed_distributions, get_prog
File "/usr/local/lib/python3.5/dist-packages/pip/utils/__init__.py", line 27, in <module>
from pip._vendor import pkg_resources
File "/usr/local/lib/python3.5/dist-packages/pip/_vendor/pkg_resources/__init__.py", line 3018, in <module>
@_call_aside
File "/usr/local/lib/python3.5/dist-packages/pip/_vendor/pkg_resources/__init__.py", line 3004, in _call_aside
f(*args, **kwargs)
File "/usr/local/lib/python3.5/dist-packages/pip/_vendor/pkg_resources/__init__.py", line 3046, in _initialize_master_working_set
dist.activate(replace=False)
File "/usr/local/lib/python3.5/dist-packages/pip/_vendor/pkg_resources/__init__.py", line 2578, in activate
declare_namespace(pkg)
File "/usr/local/lib/python3.5/dist-packages/pip/_vendor/pkg_resources/__init__.py", line 2152, in declare_namespace
_handle_ns(packageName, path_item)
File "/usr/local/lib/python3.5/dist-packages/pip/_vendor/pkg_resources/__init__.py", line 2092, in _handle_ns
_rebuild_mod_path(path, packageName, module)
File "/usr/local/lib/python3.5/dist-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‘
然后我试了很多种方法，而且还根据许多其他答案pip3 install --upgrade pip setuptools等等都不行，最终还是在外文的一个讨论区找到一个，修改了一下，觉得还可以：
具体来说就是编辑文件#2121~2122 : "sudo vim /usr/local/lib/python3.5/dist-packages/pip/_vendor/pkg_resources/__init__.py"
#orig_path.sort(key=position_in_sys_path) #module.__path__[:] = [_normalize_cached(p) for p in orig_path] orig_path_t = list(orig_path) orig_path_t.sort(key=position_in_sys_path) module.__path__[:] = [_normalize_cached(p) for p in orig_path_t]
这样问题就解决啦。打开文件左下角有行号方便查找（如果初次使用vim编辑器，而且希望多会一些vim编辑器，以及对其进行设置，永远显示行号可以看我的另一篇里面有写http://www.cnblogs.com/gaofighting/p/8527421.html）
