Python3 Setup Virtual Environment

Install PIP3

 $ sudo apt-get install python3-pip

Install virtualenv

 $ pip3 install --user virtualenv

Create a Virtual Environment

 $ python3  -m virtualenv venv

Activate a Virtual Environment

 $ source venv/bin/activate

Freeze pip packages to a file

 $ pip freeze > requirements.txt

Install pip packages from a file

 $ pip install -r requirements.txt

Deactivate a Virtual Environment

 $ deactivate