MacOS, Python: ModuleNotFoundError: No module named 'kiwisolver'

Question

I tried to import kiwisolver in Atom on MacOS Sierra, and I get the error it is not found:

Input:

import kiwisolver as kiwi

Output:

Traceback (most recent call last):
File "/Users/Kev/Documents/Uvic/Python/PHYS 321B/A6Q5&6_Coupled_Oscillators_Matrix.py", line 3, in <module>
import kiwisolver as kiwi
ModuleNotFoundError: No module named 'kiwisolver'

The problem is that it is already installed:

w134-87-183-190:~ Kev$ sudo python -m pip install kiwisolver

The directory '/Users/Kev/Library/Caches/pip/http' or its parent directory is not owned by the current user and the cache has been disabled. Please check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.
The directory '/Users/Kev/Library/Caches/pip' or its parent directory is not owned by the current user and caching wheels has been disabled. check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.
Collecting kiwisolver
Downloading kiwisolver-1.0.1-cp27-cp27m-macosx_10_6_intel.macosx_10_9_intel.macosx_10_9_x86_64.macosx_10_10_intel.macosx_10_10_x86_64.whl (110kB)
100% |████████████████████████████████| 112kB 831kB/s 
Requirement already satisfied: setuptools in /System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python (from kiwisolver)
Installing collected packages: kiwisolver
Successfully installed kiwisolver-1.0.1

w134-87-183-190:~ Kev$ sudo python3 -m pip install kiwisolver

The directory '/Users/Kev/Library/Caches/pip/http' or its parent directory is not owned by the current user and the cache has been disabled. Please check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.
The directory '/Users/Kev/Library/Caches/pip' or its parent directory is not owned by the current user and caching wheels has been disabled. check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.
Requirement already satisfied: kiwisolver in /Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages
Requirement already satisfied: setuptools in /Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages (from kiwisolver)

Has anyone encountered this issue? How do I resolve this issue? I need it to run Matplotlib.

Edit: I'm using Python 3.6.

w134-87-183-190:~ Kev$ python -V
Python 2.7.10

w134-87-183-190:~ Kev$ python --version 
Python 2.7.10

w134-87-183-190:~ Kev$ python3 --version 
Python 3.6.4

In atom, I have this in my config.cson. All three paths give the same error:

runner:
    scopes:
      # python: "/usr/local/bin/python3"
      # python: "/Library/Frameworks/Python.framework/Versions/3.6/Python"
      python: "/Library/Frameworks/Python.framework/Versions/3.6/bin/python3.6"

Answer 1

After 3+ hours of agony, the solution turned out to be quite simple.

Uninstall Kiwisolver:

pip3 uninstall kiwisolver 

Then reinstalling Kiwisolver:

pip3 install kiwisolver