pip version 20.0.2 code example
Example: 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
$ pip download SomePackage
$ pip download -d . SomePackage # equivalent to above
$ pip download --no-index --find-links=/tmp/wheelhouse -d /tmp/otherwheelhouse SomePackage