How can I control keyboard repeat delay in a Tkinter root window?

This is not something configurable in Tk -- Tk has no control over how fast the keyboard driver sends repeated key events.

What you can do instead is have a binding on the button press and button release to set and then unset a flag. Then, you can write a function that does whatever you want it to do, then check the flag and call itself again after whatever delay you want.

The function would look something like this:

def hello(x):    global SHOULD_REPEAT    print "hello"    if SHOULD_REPEAT:        root.after(10, hello) # wait 10ms then repeat

To do it right requires a little bit more logic, but that's the general idea.

Below is a complete example based on Bryan's answer in this post:

try:                        # In order to be able to import tkinter for    import tkinter as tk    # either in python 2 or in python 3except ImportError:    import Tkinter as tkdef step(*event):    label['text'] += 1    if label._repeat_on:        root.after(label._repeat_freq, step)def stop(*event):    if label._repeat_on:        label._repeat_on = False        root.after(label._repeat_freq + 1, stop)    else:        label._repeat_on = Trueif __name__ == '__main__':    root = tk.Tk()    label = tk.Label(root, text=0)    label._repeat_freq = 10    label._repeat_on = True    root.bind('<KeyPress-s>', step)    root.bind('<KeyRelease-s>', stop)    label.pack()    root.mainloop()