configure python 3 for virtualenv code example

Example 1: how to make a virtual environment python 3

#create the venv
python -m venv name_virtual_env
    #or
python3 -m venv name_virtual_env

#activate venv
    #linux:
source name_virtual_env/bin/activate

    #windows
name_virtual_env\Scripts\activate

Example 2: create a virtualenv python3

py -m venv env