如何递归删除目录中除特定文件类型和文件夹以外的所有文件？

import os

def delete_files_except_specific_types(directory, specific_types, specific_folders):
    for root, dirs, files in os.walk(directory):
        for file in files:
            file_path = os.path.join(root, file)
            file_extension = os.path.splitext(file)[1].lower()
            if file_extension not in specific_types and root not in specific_folders:
                os.remove(file_path)

# 示例调用
directory = '/path/to/directory'  # 目标目录路径
specific_types = ['.txt', '.pdf']  # 特定文件类型列表
specific_folders = ['/path/to/folder']  # 特定文件夹列表
delete_files_except_specific_types(directory, specific_types, specific_folders)