b.py

from tkinter import filedialog, Tk
from PIL import Image

rt=Tk()
rt.withdraw()
path=filedialog.askopenfilenames(title='选择图片文件',filetypes=[('png','.png')],initialdir='./')
sequence=[]
for i in path:
    img=Image.open(i)
    sequence.append(0,img)
sequence[0].save("bot.gif",save_all=True,
                append_images=sequence[1:])