Instalar e usar o Anaconda:
https://www.anaconda.com/products/individual
(all-in-one)
OU
Fazer o download e a instalação do Python em
https://www.python.org/downloads/
Fazer o download e a instalação do PyCharm Community:
https://www.jetbrains.com/pycharm/download/#section=mac
Guia do PyCharm:
https://www.jetbrains.com/help/pycharm/quick-start-guide.html