Visit Python’s official download link and select the flavor of Python you desire:
https://www.python.org/downloads/
Download Python for macOS
https://www.python.org/downloads/macos/
Download Python for Windows
https://www.python.org/downloads/windows/
You can also visit the Microsoft Store and download it from there.
Download Python for Linux/UNIX
https://www.python.org/downloads/source/
Download Python for other platforms/operating systems
https://www.python.org/download/other/