Random Slideshow

# -*- coding: utf-8 -*-

# Using Python 3.5.4

import tkinter as Tk
import os
from PIL import Image, ImageTk
import random

root = Tk.Tk()

############## PARAMETER ##############

# Change the directory that is going to be scanned
path = r"C:\PATH\TO\THE\PICTURES\FOLDER"

#######################################

print("Start of indexation")
print("Indexation can last some time")

#loading all the pictures in a list
imagelist = []
for dirpath, subdirs, files in os.walk(path):
    for x in files:
        try : image = Image.open(os.path.join(dirpath, x))
        except : pass
        photo = ImageTk.PhotoImage(image)
        imagelist.append(photo)

print(str(len(imagelist)) + " pictures loaded")

if len(imagelist) == 0:
    raise Exception("no pictures to show in this directory")


#this label will be used to show pictures
lbl = Tk.Label(root)

print("Starting the slideshow")

def slideshow():
    ok = False
    while ok == False:
        random.seed()
        try:
            #choosing a random picture
            lbl.config(image = imagelist[random.randint(0, len(imagelist)-1)])
            ok = True
        except:
            pass
    random.seed()
    root.after(random.randint(500, 2500), slideshow)  #recalling the function after some time

lbl.pack()
root.after(100, slideshow)
root.mainloop()