python image copy

def fetch_data():
    file_dir = r"G:/26Pan/SNAY0S4930464_yc2128_1569812044"
    save_path = 'G:/old_people/'
    index = 0
    for i in os.listdir(file_dir):
        index = index + 1
        print(index)
        if 'ir' in i and '120cm' not in i:
            ori_img = os.path.join(file_dir, i).replace('\\', '/')#原图片路径
            print(ori_img)
            img_name = ori_img.replace('/', '_')[3:]
            save_img = os.path.join(save_path, img_name)#图片保存路径
            print(save_img)
            shutil.copyfile(ori_img, save_img.replace('\\', '/'))