python -m pip install Pillow

from PIL import Image
import os

def get_size(file):
    # 获取文件大小:KB
    size = os.path.getsize(file)
    return size / 1024

dir_path = r'file_path'
items = os.listdir(dir_path)

for item in items:
    # print(item)
    path = os.path.join(dir_path, item)
    print(item)

def compress_image(infile, outfile=None, mb=150, step=10, quality=80):
    """不改变图片尺寸压缩到指定大小
    :param infile: 压缩源文件
    :param outfile: 压缩文件保存地址
    :param mb: 压缩目标，KB
    :param step: 每次调整的压缩比率
    :param quality: 初始压缩比率
    :return: 压缩文件地址，压缩文件大小
    """
    if outfile is None:
        outfile = infile
    o_size = get_size(infile)
    if o_size <= mb:
        im = Image.open(infile)
        im.save(outfile)

    while o_size > mb:
        im = Image.open(infile)
        im.save(outfile, quality=quality)
        if quality - step < 0:
            break
        quality -= step
        o_size = get_size(outfile)

def resize_image(infile, outfile='', x_s=800):
    """修改图片尺寸
    :param infile: 图片源文件
    :param outfile: 重设尺寸文件保存地址
    :param x_s: 设置的宽度
    :return:
    """
    im = Image.open(infile)
    x, y = im.size
    y_s = int(y * x_s / x)
    out = im.resize((x_s, y_s), Image.ANTIALIAS)

    out.save(outfile)

if __name__ == '__main__':
                      # 源路径      # 压缩后路径
    compress_image(r"file_path", r"E:\docs\2.JPG")
                    # 源路径      # 压缩后路径
    resize_image(r"file_path", r"E:\docs\3.JPG")

import os
from PIL import Image
import threading,time

def imgToProgressive(path):
    if not path.split('.')[-1:][0] in ['png','jpg','jpeg']:  #if path isn't a image file,return
        return
    if os.path.isdir(path):
        return
##########transform img to progressive
    img = Image.open(path)
    destination = path.split('.')[:-1][0]+'_destination.'+path.split('.')[-1:][0]
    try:
        print(path.split('\\')[-1:][0],'开始转换图片')
        img.save(destination, "JPEG", quality=80, optimize=True, progressive=True) #转换就是直接另存为
        print(path.split('\\')[-1:][0],'转换完毕')
    except IOError:
        PIL.ImageFile.MAXBLOCK = img.size[0] * img.size[1]
        img.save(destination, "JPEG", quality=80, optimize=True, progressive=True)
        print(path.split('\\')[-1:][0],'转换完毕')
    print('开始重命名文件')
    os.remove(path)
    os.rename(destination,path)

for d,_,fl in os.walk(os.getcwd()):    #遍历目录下所有文件
    for f in fl:
        try:
            imgToProgressive(d+'\\'+f)
        except:
            pass