PIP update / set virtual enviroment and get requierement.txt and install it

virtualenv_pip_python.sh

# PIP / VIRTUALENV
# ----------------
python -m pip install --upgrade pip || \
#
apt update && \
apt install python-pip python3-pip python3-virtualenv
# OLD: ( pip install virualenv )
virtualenv [--python=python3] project-XYZ
cd project-XYZ ; source bin/activate
#

# OUT:
# pip list
deactivate


# ---------------------------

pip freeze [--local] > requirements.txt

# INSTALL REQUIREMENTS:
# pip install -r requirements.txt
#