Python GUI Programming Cookbook, Second Edition - Second Edition

Getting ready

Let's first see what happens when we call a function or a method of our GUI that has some sleep associated with it without using threads.

We are using sleep here to simulate a real-world application that might have to wait for a web server or database to respond, a large file transfer, or complex computations to complete its task. sleep is a very realistic placeholder and shows the principle involved.

Adding a loop into our button callback method with some sleep time results in our GUI becoming unresponsive and, when we try to close the GUI, things get even worse: GUI_multiple_threads_sleep_freeze.py

    # Button callback    def click_me(self):         self.action.configure(text='Hello ' + self.name.get() + ' '  + self.number_chosen.get()) ...