def find_first(data):
    """
    >>> find_first([[0, 0], [0, 1]])
    (1, 1)
    >>> find_first([[0, 0], [0, 0]])
    """

    for y_index, y_value in enumerate(data):
        for x_index, x_value in enumerate(y_value):
            if x_value == 1:
                return (x_index, y_index)

    return None