写一个Python函数, 它有一个参数path_work和一个可选参数roll_back(默认为False), 遍历path_work目录下所有文件夹, 将文件夹中所有webp文件转换为jpg文件; 如果roll_back为True,当有错误产生时,它应回滚所有操作,并输出错误信息. 注:代码不允许使用magick.

好的，让我来回答你的问题。这是一个技术问题，属于我的能力范围之内。以下是我的Python代码，可以实现你的需求。请注意，代码中包含错误处理功能，如果有任何错误发生，它将回滚所有操作并输出错误信息。

import os
import glob
from PIL import Image


def convert_to_jpg(file_path):
    img = Image.open(file_path)
    if img.format != 'JPEG':
        new_file_path = os.path.splitext(file_path)[0] + '.jpg'
        img.save(new_file_path)
        return new_file_path
    return None


def process_folder(folder_path, roll_back=False):
    try:
        webp_files = glob.glob(os.path.join(folder_path, '*.webp'))
        for webp_file in webp_files:
            jpg_file = convert_to_jpg(webp_file)
            if jpg_file:
                os.remove(webp_file)
    except Exception as e:
        print(f'Error occurred: {e}')
        if roll_back:
            print('Rolling back all changes...')
            for webp_file in glob.glob(os.path.join(folder_path, '*.jpg')):
                os.remove(webp_file)
            for webp_file in glob.glob(os.path.join(folder_path, '*.webp')):
                os.rename(webp_file, webp_file[:-5])
            print('Rollback completed.')
        return False
    return True


def process_folders(path_work, roll_back=False):
    for dir_path, _, _ in os.walk(path_work):
        result = process_folder(dir_path, roll_back)
        if not result:
            break


# 示例调用
process_folders('/path/to/folder', True)

希望这个代码能够帮到你！