There's almost certainly going to be a caveat of "you need your OS's version of tkinter for python installed first", but in theory we could start building and distributing a wheel.
We can't guarantee there's a terminal/console to print to that's visible to the user.
tkinter isn't available so we can't make a popup window.
No reasonably common "display some text in a popup" utility is available.
Then write the message to a file, probably HTML, and ask the system to open it. This would either open a web browser tab/window to show it, or possibly a text editor.
There's almost certainly going to be a caveat of "you need your OS's version of tkinter for python installed first", but in theory we could start building and distributing a wheel.