tkinter 이미지 갤러리(버튼 다음/이전 이미지)

import os
path = os.path.join("이미지 경로")
file_list = os.listdir(path)

def read_img(file_path):
    img = Image.open(file_path)
    
    if img.size[0] > 1000 or img.size[1] > 1000:
        img = img.resize((int(img.width / 2), int(img.height / 2)))
    
    return img

# jpg 리스트로 이미지 열기 + 다음버튼까지

def forward(image_number):
    global label
    global button_forward
    global button_back
    
    label.grid_forget()
    label = Label(image=img_list[image_number-1])
    button_forward = Button(window, text=">>", command=lambda : forward(image_number+1))
    button_back = Button(window, text="<<", command=lambda : back(image_number-1))
    
#     if image_number == len(img_list):
    if image_number == len(img_list[:5]):
        button_forward = Button(window, text=">>", state=DISABLED)

    label.grid(row=0, column=0, columnspan=3)
    button_back.grid(row=1, column=0)
    button_forward.grid(row=1, column=2)
    
def back(image_number):
    global label
    global button_forward
    global button_back

    label.grid_forget()
    label = Label(image=img_list[image_number-1])
    button_forward = Button(window, text=">>", command=lambda : forward(image_number+1))
    button_back = Button(window, text="<<", command=lambda: back(image_number-1))

    if image_number ==1:
        button_back = Button(window, text="<<", state = DISABLED)

    label.grid(row=0, column=0, columnspan=3)
    button_back.grid(row=1, column=0)
    button_forward.grid(row=1, column=2)
    
from tkinter import *
from PIL import ImageTk,Image


window = Tk()
window.config(padx=10, pady=10)
window.title("수정 툴")

canvas = Canvas(window)
canvas.grid(column=0, row=1, columnspan=2)

img_list = []
for file in file_list[:5]:
    file_path = path + file
    img = read_img(file_path)
    img_list.append(ImageTk.PhotoImage(img))

img_num = 0
label = Label(image = img_list[img_num])
label.grid(row=0, column=0, columnspan=3)

button_forward = Button(window, text=">>", command=lambda : forward(2))
# button_forward.grid(row=5, column=0)
button_forward.grid(row=1, column=2)
window.mainloop()