You should be able to see what the two arguments to showinfo do.
The first argument is the window's title bar text. If you didn't notice, click the Say Hello button again – you should see the word Hello inside the title bar of the pop-up window.
Clicking the Say Goodbye button will yield a pop-up message with Goodbye! in the title bar.
The second argument is a string containing the information which will be written inside the box.
The showinfo box contains just one button—an OK button. Clicking this button dismisses the window:
While a messagebox window is displayed, the main window is effectively ...