make python 3 virtualennv on windows code example

Example 1: create a venv

# Create the virtual environment.
python -m venv venv

# Activate the env.
venv\Scripts\activate.bat

Example 2: how to use virtual environment python

source env/bin/activate

Example 3: start python virtual

activate venv

Example 4: pip install virtualenv windows

py -m venv env