[split] Installing Python scripts

[OpaPeterPKHG]

Hello,
W10 gimp 2.10.22
How to install any python plugin.
Would like a working small example
e.g. from WW

Code:

import gimp

def python_message(image, drawable, message):
    gimp.message(message)

register(
        "python_fu_message",
        "Show message",
        "Show message",
        "Pin-Chou Liu",
        "Pin-Chou Liu",
        "2019",
        "<Image>/Filters/Hello World...",
        "",
        [
            (PF_STRING, "message", "message", "Hello World"),
        ],
        [],
        python_message)

main()