在虚拟环境python3.6下执行如下指令：
(pyDense3.6) Xdn@xwfx:~/.conda/envs/pyDense3.6$ pip install chumpy
出现错误：
Traceback (most recent call last):
File "/home/Xdn/.conda/envs/pyDense3.6/bin/pip", line 4, in
import pip
File "/home/Xdn/.conda/envs/pyDense3.6/lib/python3.6/site-packages/pip/__init__.py", line 26, in
from pip.utils import get_installed_distributions, get_prog
File "/home/Xdn/.conda/envs/pyDense3.6/lib/python3.6/site-packages/pip/utils/__init__.py", line 27, in
from pip._vendor import pkg_resources
File "/home/Xdn/.conda/envs/pyDense3.6/lib/python3.6/site-packages/pip/_vendor/pkg_resources/__init__.py", line 3018, in
@_call_aside
File "/home/Xdn/.conda/envs/pyDense3.6/lib/python3.6/site-packages/pip/_vendor/pkg_resources/__init__.py", line 3004, in _call_aside
f(*args, **kwargs)
File "/home/Xdn/.conda/envs/pyDense3.6/lib/python3.6/site-packages/pip/_vendor/pkg_resources/__init__.py", line 3046, in _initialize_master_working_set
dist.activate(replace=False)
File "/home/Xdn/.conda/envs/pyDense3.6/lib/python3.6/site-packages/pip/_vendor/pkg_resources/__init__.py", line 2578, in activate
declare_namespace(pkg)
File "/home/Xdn/.conda/envs/pyDense3.6/lib/python3.6/site-packages/pip/_vendor/pkg_resources/__init__.py", line 2152, in declare_namespace
_handle_ns(packageName, path_item)
File "/home/Xdn/.conda/envs/pyDense3.6/lib/python3.6/site-packages/pip/_vendor/pkg_resources/__init__.py", line 2092, in _handle_ns
_rebuild_mod_path(path, packageName, module)
File "/home/Xdn/.conda/envs/pyDense3.6/lib/python3.6/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'
问题解决：
参考：https://stackoverflow.com/questions/47955397/pip3-error-namespacepath-object-has-no-attribute-sort
简单来说就是：在__init__.py中第2021行orig_path.sort时没有sort属性，参考如上解答，将2021-2022行的代码换为如下：
#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]
该方法解决了我的问题，网上也有通过更新PIP和setuptools解决该问题的，我也尝试了这些方法但是对我的问题没有生效。
修改后运行结果：
(pyDense3.6) Xdn@xwfx:~/.conda/envs/pyDense3.6$ pip install chumpy
Collecting chumpy
Cache entry deserialization failed, entry ignored
Using cached https://files.pythonhosted.org/packages/87/81/d7a94ad0ff556b9dd1bf27b84c0b255d9ba22ad5952f20088dafacd9292e/chumpy-0.69.tar.gz
Requirement already satisfied: numpy>=1.8.1 in /home/Xdn/.local/lib/python3.6/site-packages (from chumpy)
Requirement already satisfied: scipy>=0.13.0 in ./lib/python3.6/site-packages (from chumpy)
Requirement already satisfied: six>=1.11.0 in /home/Xdn/.local/lib/python3.6/site-packages (from chumpy)
Building wheels for collected packages: chumpy
Running setup.py bdist_wheel for chumpy ... done
Stored in directory: /home/Xdn/.cache/pip/wheels/df/11/36/2758327d759bad62803f3f9190db1c063e52a0358cecd33e94
Successfully built chumpy
Installing collected packages: chumpy
Successfully installed chumpy-0.69