def truncate_column(data_column, truncation_point):
    """
    Abstraction of numpy slicing operation for 1D array truncation.
    :param data_column: 1D np.array
    :param truncation_point: int of truncation index to test
    :return: np.array
    """
    assert (len(data_column.shape) == 1)  # Assert data_column is a 1D numpy array
    return data_column[-1 * truncation_point:]