Python GUI Programming with Tkinter

The update() and update_idletasks () methods

In Chapter 10, Creating Automated Tests with unittest, you also learned about the update() and update_idletasks() methods. To review, these methods will cause Tkinter to execute any tasks currently in the event queue; update() runs tasks currently waiting in the queue until it's entirely clear, while update_idletasks() only runs the idle tasks. This is generally less important and safer code, so it's recommended to use update_idletasks() unless it doesn't do the job.