Python批量压缩文件夹下面的图片

import os
from PIL import Image

def compress_image(infile, outfile):
    try:
        with Image.open(infile) as im:
            im.save(outfile, 'JPEG', quality=70)
    except OSError:
        print("Cannot convert", infile)

def batch_compress_image(input_dir, output_dir):
    if not os.path.exists(output_dir):
        os.makedirs(output_dir)
    files = os.listdir(input_dir)
    valid_images = [".jpg", ".jpeg", ".png", ".gif"]
    for file in files:
        extension = os.path.splitext(file)[1]
        if extension.lower() in valid_images:
            infile = os.path.join(input_dir, file)
            outfile = os.path.join(output_dir, file)
            compress_image(infile, outfile)

source = "//ShareFolderE/"
files_list = os.listdir(source)
for files in files_list:
    input_dir="//ShareFolderE/"+files
    print(input_dir)
    batch_compress_image(input_dir, input_dir)