pip 21.0 has been released on Jan 23 (2021). It is not compatible with Python2. However, python -m easy_install pip
now installs pip 21(.0). This will be a problem when we want to use latest pip while python-setuptools is provided by system package.
For now, python -m easy_install 'pip<21'
seems working.
210311: maybe python -m easy_install 'pip~=20.0'
is better as system-pip needs to be updated.