I am using OSX and I have pip installed for both Python3.5 and Python2.7. I know I can run the command pip2 to use Python2 and when I use the command pip3
pip2
pip3
It works for me:
As super-user
Uninstall pip
sudo pip uninstall pip
Install pip
sudo python3 -m pip install --upgrade --force pip
Check install path
sudo pip -V
As local-user
pip uninstall pip
python3 -m pip install --upgrade --force pip
pip -V