[Tkinter] How to create a delay for AI without freezing the GUI

[Yoriz]

You have to use the canvas.after method for calling methods of the gui, it moves the calls back into the mainloops thread.
The follwing is an code from that thread

class MainFrame(tk.Frame):
 
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        ....
        ....

    def set_label_text(self, text=''):
        self.label['text'] = text

    def blocking_code(self):
        self.after(0, self.set_label_text, 'running')
 
        for number in range(5):
            self.after(0, self.listbox_insert, number)
            print(number)
            time.sleep(1)
 
        self.after(0, self.set_label_text, ' not running')

In the method blocking_code self.after(0, self.set_label_text, 'running') is calling self.set_label_text back in the mainloops thread.