How to use the m3u8.parser.is_url function in m3u8

def _urijoin(base_uri, path):
    if is_url(base_uri):
        return url_parser.urljoin(base_uri, path)
    else:
        return os.path.normpath(os.path.join(base_uri, path.strip('/')))

def load(uri):
    '''
    Retrieves the content from a given URI and returns a M3U8 object.
    Raises ValueError if invalid content or IOError if request fails.
    '''
    if is_url(uri):
        return _load_from_uri(uri)
    else:
        return _load_from_file(uri)

def load(uri, timeout=None, headers={}, custom_tags_parser=None, http_client=DefaultHTTPClient(), verify_ssl=True):
    '''
    Retrieves the content from a given URI and returns a M3U8 object.
    Raises ValueError if invalid content or IOError if request fails.
    '''
    if is_url(uri):
        content, base_uri = http_client.download(uri, timeout, headers, verify_ssl)
        return M3U8(content, base_uri=base_uri, custom_tags_parser=custom_tags_parser)
    else:
        return _load_from_file(uri, custom_tags_parser)

def absolute_uri(self):
        if self.uri is None:
            return None
        if is_url(self.uri):
            return self.uri
        else:
            if self.base_uri is None:
                raise ValueError('There can not be `absolute_uri` with no `base_uri` set')
            return _urijoin(self.base_uri, self.uri)