def get_file_ext_type(drive_file):
    """
    :param drive_file: The GoogleDriveFile to get the file type of
    Uses the MIME type.
    Options are:
    folder - u'mimeType': u'application/vnd.google-apps.folder',
    other - u'mimeType': u'text/plain'
    audio - u'mimeType': u'audio/mp3'
    """
    raw_mime_type = drive_file.metadata['mimeType']
    if 'google-apps.folder' in raw_mime_type:
        return 'folder'
    if 'audio' in raw_mime_type:
        return 'audio'
    else:
        return 'other'