How to use the johnnydep.compat.urlretrieve function in johnnydep

def _download_dist(url, scratch_file, index_url, extra_index_url):
    auth = None
    if index_url:
        parsed = urlparse(index_url)
        if parsed.username and parsed.password and parsed.hostname == urlparse(url).hostname:
            # handling private PyPI credentials in index_url
            auth = (parsed.username, parsed.password)
    if extra_index_url:
        parsed = urlparse(extra_index_url)
        if parsed.username and parsed.password and parsed.hostname == urlparse(url).hostname:
            # handling private PyPI credentials in extra_index_url
            auth = (parsed.username, parsed.password)
    target, _headers = urlretrieve(url, scratch_file, auth=auth)
    return target, _headers