def assert_vector2(num_vector):
    """
    Assert that a 2 item vector is numeric.

    :param num_vector: Numeric 2 item vector
    :type num_vector: tuple, list
    :return: None
    """
    assert isinstance(num_vector, (tuple, list)
        ), 'object {0} must be a list or tuple of 2 items'.format(num_vector)
    assert len(num_vector) == 2 and isinstance(num_vector[0], (int, float)
        ) and isinstance(num_vector[1], (int, float)
        ), 'each object of {0} must be integer or float'.format(num_vector)
