Answers for "virtualenv -venv"

virtualenv -p python3

virtualenv -p python3.6 venv

For simple python3

virtualenv -p python3 venv

venv python

python3 -m venv env    # create env
source env/bin/activate    # activate env
deactivate    # deactivate env
rm -r env/    # delete env in Linux
pip freeze    # show all packages installed
pip install -r requirements.txt   # install all packages
pip freeze > requirements.txt    # create automatically requirements.txt