Image Viewer

from tkinter import *

from PIL import ImageTk, Image

def forward(img_no):

    global label

    global button_forward

    global button_back

    global button_exit

    label.grid_forget()

    label = Label(image=List_images[img_no-1])

    label.grid(row=1, column=0, columnspan=3)

    button_for = Button(root, text="forward",

                        command=lambda: forward(img_no+1))

    if img_no == 4:

        button_forward = Button(root, text="Forward",

                                state=DISABLED)

    button_back = Button(root, text="Back",

                        command=lambda: back(img_no-1))

    button_back.grid(row=5, column=0)

    button_exit.grid(row=5, column=1)

    button_for.grid(row=5, column=2)

def back(img_no):

    global label

    global button_forward

    global button_back

    global button_exit

    label.grid_forget()

    label = Label(image=List_images[img_no - 1])

    label.grid(row=1, column=0, columnspan=3)

    button_forward = Button(root, text="forward",

                            command=lambda: forward(img_no + 1))

    button_back = Button(root, text="Back",

                        command=lambda: back(img_no - 1))

    print(img_no)

    if img_no == 1:

        button_back = Button(root, Text="Back", state=DISABLED)

    label.grid(row=1, column=0, columnspan=3)

    button_back.grid(row=5, column=0)

    button_exit.grid(row=5, column=1)

    button_for.grid(row=5, column=2)

root = Tk()

root.title("Image Viewer")

root.geometry("700x700")

image_no_1 = ImageTk.PhotoImage(Image.open("sample.jpg"))

image_no_2 = ImageTk.PhotoImage(Image.open("sample.jpg"))

image_no_3 = ImageTk.PhotoImage(Image.open("sample.jpg"))

image_no_4 = ImageTk.PhotoImage(Image.open("sample.jpg"))

List_images = [image_no_1, image_no_2, image_no_3, image_no_4]

label = Label(image=image_no_1)

label.grid(row=1, column=0, columnspan=3)

button_back = Button(root, text="Back", command=back,

                    state=DISABLED)

button_exit = Button(root, text="Exit",

                    command=root.quit)

button_forward = Button(root, text="Forward",

                        command=lambda: forward(1))

button_back.grid(row=5, column=0)

button_exit.grid(row=5, column=1)

button_forward.grid(row=5, column=2)

root.mainloop()