b.py

from tkinter import filedialog,Tk
from PIL import Image
from PIL import Image,ImageSequence

rt=Tk()
rt.withdraw()
ph=filedialog.askopenfilenames(title='选择图片文件',filetypes=[('png','.png')],initialdir='./')
sequence = []
im=Image.open('dive.gif')
num=0

for i in ImageSequence.Iterator(im):
    i.save('turn/'+str(num)+'.png')
    num += 1
for i in ph:
    img = Image.open(i)
    sequence.insert(0,img)

sequence[0].save("xbdts.gif", save_all=True,append_images=sequence[1:])