[Mac] Building a virtual environment for Python

We will build a virtual environment for Python. Start from where Python 3 is installed.

Make sure python3 is installed

$ python3 -V

** Install and configure virtual env **

$ python3 -m venv env
$ pip3 install virtualenv
$ virtualenv --python=/usr/local/bin/python3 env

** Enter the virtual environment **

$ source env/bin/activate

** Escape from the virtual environment **

$ deactivate

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