Windows Retirez PIP
pip uninstall pip
Lucky-Magnet
pip uninstall pip
# python2
pip uninstall package_name
# python3
pip3 uninstall package_name
#the best way to install pip if uninstalled is using the following command
python -m ensurepip
# not only it will check whether there is pip installed , it will install
# for you if not found
pip uninstall <package_name>
To install it again : python -m pip install --upgrade pip
This is in windows command prompt or powershell
python -m ensurepip --upgrade