如何让 imagePath 变量实时更新？

Question

我想在按下按钮时更改 gif，并且该变量确实保存了图像路径字符串，但它只是不会更改屏幕上的图像。 有任何想法吗？

import tkinter as tk
from tkinter import *
from PIL import Image, ImageTk, ImageSequence

root = Tk()
root.bind("<Escape>", lambda x: root.destroy())
root.geometry("320x240")
root.configure(background='black')

imagePath = Image.open(r'resources\splash.gif')

def changeGif():
    global imagePath
    imagePath = Image.open(r'resources\dna.gif')
    print('updated')
    
    

class displayGif():
    def __init__(self, parent):
        self.parent = parent
        self.canvas = tk.Canvas(parent, width=180, height=180)
        self.canvas = Canvas(root, bd=-2, bg='black', width=180, height=180)
        self.canvas.place(x=100, y=30)
        self.sequence = [ImageTk.PhotoImage(img)
        for img in ImageSequence.Iterator(imagePath)]
        self.image = self.canvas.create_image(90,90, image=self.sequence[0])
        self.animate(1)
    def animate(self, counter):
        self.canvas.itemconfig(self.image, image=self.sequence[counter])
        self.parent.after(80, lambda: self.animate((counter+1) % len(self.sequence)))
        
btn = PhotoImage(file = r"resources\left-middle.png")
Button(root, text = '', image = btn, bd=0, highlightthickness=0, bg='black', activebackground='black', command=lambda: changeGif()).place(x=0, y=54)

displayGif(root)    
root.focus_force()
root.mainloop()