def succeeded(obj):
    """Return a Boolean that indicates if the value is an instance of smonad.types.ftry.Success

    >>> from smonad.types.ftry import Failure, Success
    >>> succeeded(Success(True))
    True
    >>> succeeded(Failure('fubar'))
    False
    """
    from smonad.types.ftry import Try, Success
    assert isinstance(obj, Try)
    return isinstance(obj, Success)
