Button Flash() in tkinter Python

Button flash several times between active and normal colors. When button is disabled  it Ignored.

******Your code Below*****

from tkinter import*

root = Tk()
root.title("Button Flush")
root.geometry("800x350+450+86")

lbl =Label(root,font=("times", 20, "bold"),text ='Press f to make button flash')
lbl.pack(pady=50)

btn =Button(root,text = 'Useless Button',font=("times", 20, "bold"),bg="red")
btn.pack()

def flash(event):
    btn.config(bg = 'yellow')
    root.after(1000, lambda: btn.config(bg = 'green'))

root.bind("<KeyPress-f>", flash)

root.mainloop()

********End Code**********

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Enjoy..............

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