I'm writing a slideshow program with Tkinter, but I don't know how to go to the next image without binding a key.

import os, sys
import Tkinter
import Image, ImageTk
import time

root = Tkinter.Tk()
w, h = root.winfo_screenwidth(), root.winfo_screenheight()
root.overrideredirect(1)
root.geometry("%dx%d+0+0" % (w, h))
root.focus_set()

root.bind("<Escape>", lambda e: e.widget.quit())

image_path = os.path.join(os.getcwd(), 'images/')
dirlist = os.listdir(image_path)

for f in dirlist:
    try:
        image = Image.open(image_path+f)
        tkpi = ImageTk.PhotoImage(image)        
        label_image = Tkinter.Label(root, image=tkpi) # ?
        label_image.place(x=0,y=0,width=w,height=h)
        root.mainloop(0)
    except IOError:
        pass
root.destroy()

I would like to add a time.sleep(10) "instead" of the root.mainloop(0) so that it would go to the next image after 10s. Now it changes when I press ESC. How can I have a timer there?