how to install python3.9 on mac code example

Example 1: command to install python3.6 on mac os

$ brew install --ignore-dependencies https://raw.githubusercontent.com/Homebrew/homebrew-core/f2a764ef944b1080be64bd88dca9a1d80130c558/Formula/python.rb

Example 2: mac install python 3.8

brew install python@3.8