Multiple Python versions

Because one does not simply mess with MacOS default Python

Install Homebrew
Homebrew is a package manager for MacOS, must have CLI utility.
/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
Install latest python
MacOS comes with a python version but you should install the latest stable version of python.
 brew install python
Install pip
Download the get-pip file
curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py
Now run this file to install pip
python get-pip.py
Change global default python to latest python
sudo ln -s -f /usr/local/bin/python3.9 /usr/local/bin/python
Install pyenv
pyenv makes it easy to install, manage, and switch between multiple Pythons versions.
brew install pyenv
Install multiple python versions in pyenv
pyenv install 3.9.4
pyenv install 2.7.16
Change default python in pyenv to latest and greatest
pyenv global 3.9.4
Running pyenv
pyenv versions
python -m venv venv
source ./venv/bin/activate
(venv) $ which python
To exit the virtual environment
deactivate
References
​https://opensource.com/article/19/6/python-virtual-environments-mac​
​https://jacobian.org/2019/nov/11/python-environment-2020/ ​

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