我想做一些可以改变事物图片的东西。当用户点击按钮时，图片应该会改变。如果我之前加载图像，它可以工作，但是当 gui 运行时我无法更改图像
from PIL import Image, ImageTk
import tkinter as tk
all_pfps = [
r"Pfps\Red Pfp.png",
r"Pfps\Yellow Pfp.png",
]
class Login():
def __init__(self):
self.login_root = tk.Tk()
background = Image.open(r"Back -drops -grounds\Darker Background.png")
render_background = ImageTk.PhotoImage(background)
pfp = Image.open(all_pfps[0])
render_pfp = ImageTk.PhotoImage(pfp)
self.backdrop = tk.Canvas(self.login_root, height = 1080, width = 1920, bg = "dark red")
self.backdrop.create_image(645, 525, image = render_background)
self.backdrop.create_image(1757, 163, image = render_pfp)
self.profile_pic = tk.Menubutton(master = self.login_root, text = "Welcome to MARVEL Battlefront")
self.profile_pic.menu = tk.Menu(master = self.profile_pic, tearoff = 0)
self.profile_pic["menu"] = self.profile_pic.menu
self.profile_pic.menu.add_checkbutton(label = "Red", command = lambda: self.set_pfp(0))
self.profile_pic.menu.add_checkbutton(label = "Yellow", command = lambda: self.set_pfp(1))
self.profile_pic.pack()
self.backdrop.create_window(50, 50, window = self.profile_pic)
self.backdrop.pack()
self.login_root.mainloop()
def set_pfp(self, profile_pic: int):
pfp = Image.open(all_pfps[profile_pic])
render_pfp = ImageTk.PhotoImage(pfp)
self.backdrop.create_image(1757, 163, image = render_pfp)
Login()
现在，当单击菜单按钮时，图片应该会发生变化。但它没有。这是为什么？