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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def default_partfactory(part_number=None, content_length=None, content_type=None, content_md5=None):
 """Get default part factory. :param part_number: The part number. (Default: ``None``) :param content_length: The content length. (Default: ``None``) :param content_type: The HTTP Content-Type. (Default: ``None``) :param content_md5: The content MD5. (Default: ``None``) :returns: The content length, the part number, the stream, the content type, MD5 of the content. """

    return content_length, part_number, request.stream, content_type, \
        content_md5, None