代码：批量图片格式转换（jpg->png）

import glob
import os
import threading
from PIL import Image

def create_image(infile, index):
    os.path.splitext(infile)
    im = Image.open(infile)
    im.save("./test_240/n00000010/images/n00000010_" + str(index) + ".JPEG", "JPEG")  #存储路径

def start():
    index = 0
    for infile in glob.glob("./resize_240/images/*.jpg"):  #数据来源
        t = threading.Thread(target=create_image, args=(infile, index,))
        t.start()
        t.join()
        index += 1

if __name__ == "__main__":
    start()