def scan(stream, Loader=Loader):
    # type: (StreamTextType, Any) -> Any
    """
    Scan a YAML stream and produce scanning tokens.
    """
    loader = Loader(stream)
    try:
        while loader.scanner.check_token():
            yield loader.scanner.get_token()
    finally:
        loader._parser.dispose()

    Scan a YAML stream and produce scanning tokens.
    
dynaconf/vendor/ruamel/yaml/main.py