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PYENV=.virtualenv
if ! which virtualenv; then echo "Please install virtualenv first";  exit 2; fi
virtualenv -p python3 --no-site-packages $PYENV
. $PYENV/bin/activate
$PYENV/bin/python -m pip install -r requirements.txt

pip install pipenv
pipenv --three # --two
pipenv install [xyz..]
pipenv --py
pipenv --shell