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 paused. The Say Goodbye button demonstrates this well. The line which tells the main window to close after 2 seconds does not get executed until the messagebox is dismissed.

Try clicking the Say Goodbye button and waiting for more than 2 seconds. You will see that the main window stays open until 2 seconds after you click OK to close the messagebox window. This is important to remember.

If, for example, you are processing a large list of items and you wish to alert the user to their status, it's best to wait until all of the items are processed before using showinfo. If you put a showinfo box after each item, the user will have to continually close them in order to allow the main window to continue processing.