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In Tkinter, the mainloop() function is the core event loop that keeps a GUI application running and responsive. Once invoked, it continuously waits for events (like button clicks, key presses, or window resizing), processes them, updates the interface, and repeats this cycle until the application is closed or explicitly stopped.
When you call mainloop(), Tkinter:
Waits for events and places them in an event queue.
Processes events by invoking the associated event handlers.
Updates the GUI based on handler actions.
Repeats until the window is closed or quit() is called.
Example – Basic Tkinter App
import tkinter as tkdef on_button_click():label.config(text="Button clicked!")root = tk.Tk()root.title("Simple Tkinter App")label = tk.Label(root, text="Hello, Tkinter!")label.pack()button = tk.Button(root, text="Click Me", command=on_button_click)button.pack()root.mainloop() # Starts the event loopCopied!✕CopyHere, mainloop() keeps the window open and responsive until the user closes it.
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- In this section, we will learn how to run an application in the background using the mainloop in Python Tkinter. 1. We will use the example in Python Tkinter Mainloop Update to explain the Python Tkinter Mainloop background. 2. In Python Tkinter Mainloop Update we have displayed the date, day,andtime. Out of these only time is updating constantly w...
How do you run your own code alongside Tkinter's event loop?
Tkinter, however, hogs the time for its own event loop, and so his code won't run. Doing root.mainloop() runs, runs, and keeps running, and the only thing it runs is the event handlers.
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Code sample
def run(self):self.root = tk.Tk()self.root.protocol("WM_DELETE_WINDOW", self.callback)label = tk.Label(self.root, text="Hello World")label.pack()...python - Create a main loop with tkinter? Jul 26, 2020 python - Tkinter understanding mainloop Mar 19, 2015 tkinter Main Loop - CC 410 Textbook
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