b.py

from tkinter import filedialog, Tk
from PIL import Image

root=Tk()
root.withdraw()
path=filedialog.askopenfilenames(title='选择图片文件',filetypes=[('png','.png')],initialdir='./')
img_list=[]
for i in path:
    img=Image.open(i)
    img_list.append(img)
print(img_list)