网上下载图片并压缩

compress_pic.py

def __get_proper_size_pic_from_url(url, uplimit, workbench=tempfile.mkdtemp(), pic_name=str(time.time()*1000000)):
    pic_loc = os.path.join(workbench, pic_name+'.'+url.split('.')[-1])
    r = requests.get(url, stream=True)
    if r.status_code == 200:
        with open(pic_loc, 'wb') as f:
            r.raw.decode_content = True
            shutil.copyfileobj(r.raw, f)
    else:
        logger.warning('download pic failed with url {0}'.format(url))
        return
    pic_size = os.stat(pic_loc).st_size
    quality = 75
    while pic_size > uplimit:
        im = Image.open(pic_loc)
        # quality = int(math.sqrt(uplimit/(pic_size+1024*100))*100)
        pic_name = pic_name+'_compressed'
        pic_loc = os.path.join(workbench, pic_name+'.'+url.split('.')[-1])
        im.save(pic_loc, quality=quality)
        im.close()
        quality = int(quality/2)
        pic_size = os.stat(pic_loc).st_size
    print os.stat(pic_loc).st_size
    return pic_loc