How to use the pooch.downloaders.FTPDownloader function in pooch

Examples
    --------

    >>> downloader = choose_downloader("http://something.com")
    >>> print(downloader.__class__.__name__)
    HTTPDownloader
    >>> downloader = choose_downloader("https://something.com")
    >>> print(downloader.__class__.__name__)
    HTTPDownloader
    >>> downloader = choose_downloader("ftp://something.com")
    >>> print(downloader.__class__.__name__)
    FTPDownloader

    """
    known_downloaders = {
        "ftp": FTPDownloader,
        "https": HTTPDownloader,
        "http": HTTPDownloader,
        "sftp": SFTPDownloader,
    }

    parsed_url = parse_url(url)
    if parsed_url["protocol"] not in known_downloaders:
        raise ValueError(
            "Unrecognized URL protocol '{}' in '{}'. Must be one of {}.".format(
                parsed_url["protocol"], url, known_downloaders.keys()
            )
        )
    downloader = known_downloaders[parsed_url["protocol"]]()
    return downloader