def func(path, field_storage, temporary):
    '''基本描述

    详细描述

    Args:
        path (str): The path of the file to wrap
        field_storage (FileStorage): The :class:`FileStorage` instance to wrap
        temporary (bool): Whether or not to delete the file when the File instance is destructed

    Returns:
        BufferedFileStorage: A buffered writable file descriptor
    '''
    pass

具体参考：https://blog.csdn.net/lly1122334/article/details/80733908