Cleanly add pipenv to OS

install_pipenv.sh

#!/usr/bin/env bash

set -eu

TMP_DIR="$(mktemp -d)"
python3 <(curl -L https://bootstrap.pypa.io/get-pip.py) --no-cache-dir -I --root "${TMP_DIR}" virtualenv
sudo env PYTHONPATH="$(cd "${TMP_DIR}"/usr/local/lib/python*/*-packages/; pwd)" "${TMP_DIR}/usr/local/bin/virtualenv" "/usr/local/pipenv/"
sudo /usr/local/pipenv/bin/pip install --no-cache-dir pipenv
sudo ln -s /usr/local/pipenv/bin/pipenv /usr/local/bin

sudo bash -c "echo \"/usr/local/pipenv/bin/pip list --outdated --format=freeze | grep -v '^\-e' | cut -d = -f 1  | xargs /usr/local/pipenv/bin/pip install -U\" > /usr/local/pipenv/bin/update"
sudo chmod 754 /usr/local/pipenv/bin/update
rm -r "${TMP_DIR}"

Now it adds the script /usr/local/pipenv/bin/update you can run as root to update the pipenv install and all of its dependencies for you.