Ways to manage python version and use venv on them.

way_to_manage_python_version.md

First way: My personal peference:

pyenv to manage my python version.

pyenv install 3.7.3
pyenv local 3.7.3

Check your python version:

$ python --version
Python 3.7.3

Create the virtual environment with venv:

python -m venv venv

Then activate the Virtual Environment:

source venv/bin/activate

Check your python version:

$ python --version
Python 3.7.3

You may need to remove the previous virtual environment

rm -rf venv/bin

Real Python's way: [virtual-environments-and-pyenv](https://realpython.com/intro-to-pyenv/#virtual-environments-and-pyenv)