def check_is_iterable(py_obj):
    """ Check whether a python object is a built-in iterable.

    Note: this treats unicode and string as NON ITERABLE

    Args:
        py_obj: python object to test

    Returns:
        iter_ok (bool): True if item is iterable, False is item is not
    """

    # Check if py_obj is an accepted iterable and return
    return(isinstance(py_obj, (tuple, list, set)))