How Can I Run Custom Code Simultaneously with Tkinter's Mainloop Without Multithreading?

Running Custom Code Simultaneously with Tkinter's Event Loop

While utilizing Tkinter, it becomes apparent that its event loop consumes an excessive amount of processing time, hindering the execution of custom code. Specifically, in one instance, a simulation of a bird flock requires constant movement, but this movement is obstructed by the event loop's domination of the system.

To resolve this issue and allow custom code to run concurrently with the mainloop without the complexity of multithreading, the after method of the Tk object can be employed.

from tkinter import *

root = Tk()

def move():
    # Custom code to update bird positions

root.after(2000, move)  # Schedule the move() function to run again in 2 seconds

root.mainloop()  # Start the Tkinter event loop

The after method schedules the execution of a function after a specified interval. Here, we use it to schedule the move() function to run every 2 seconds, giving our custom code the opportunity to execute in between event loop iterations.

The declaration of the after method is as follows:

def after(self, ms, func=None, *args):
    """Call function once after given time.

    MS specifies the time in milliseconds. FUNC gives the
    function which shall be called. Additional parameters
    are given as parameters to the function call.  Return
    identifier to cancel scheduling with after_cancel."""

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