reinstall pip 9.0.1 code example

Example 1: install pip in python

python get-pip.py

Example 2: get-pip 20.2.3 dowload

$ pip download SomePackage
$ pip download -d . SomePackage  # equivalent to above
$ pip download --no-index --find-links=/tmp/wheelhouse -d /tmp/otherwheelhouse SomePackage