The easy solution is download and install the latest version of Python 3. Just grab the dmg from the website https://www.python.org/downloads/release/python-370/
Verify it was installed.
$ python3 –version
Python 3.7.0
Pip is automatically included in this version so update it. Note use pip3 for Python 3.x
$ pip3 install –upgrade pip
Successfully uninstalled pip-10.0.1
Successfully installed pip-18.0
I am running a fairly clean install of 10.13.6 High Sierra. Only developer options installed are command line tools, python 3, and R. No Homebrew.
You can simply try running these in your terminal
curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py
then
python get-pip.py
then
sudo easy_install pip
try to see if this works
from https://pip.readthedocs.io/en/stable/installing/