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import Tkinter as tk

class Example(tk.Frame):

    def __init__(self, master=None):
        tk.Frame.__init__(self, master)
        self.background = tk.Canvas(master)
        self.background.pack(expand=True, fill='both')
        self.background_image = tk.PhotoImage(file=FILE1)
        self.background.create_image(0, 0, anchor='nw', image=self.background_image)
        self.change_bg = tk.Button(text='Change background', command=self.change_bg)
        self.change_bg.pack()

    def change_bg(self):
        self.background_image = tk.PhotoImage(file=FILE2)
        self.background.create_image(0, 0, anchor='nw', image=self.background_image)

def main():
    root = tk.Tk()
    ex = Example(root)
    root.mainloop()


if __name__ == '__main__':
    main()