How to use the pyscreeze.__init__.ImageNotFoundException function in PyScreeze

if step == 2:
        confidence *= 0.95
        needleImage = needleImage[::step, ::step]
        haystackImage = haystackImage[::step, ::step]
    else:
        step = 1

    # get all matches at once, credit: https://stackoverflow.com/questions/7670112/finding-a-subimage-inside-a-numpy-image/9253805#9253805
    result = cv2.matchTemplate(haystackImage, needleImage, cv2.TM_CCOEFF_NORMED)
    match_indices = numpy.arange(result.size)[(result > confidence).flatten()]
    matches = numpy.unravel_index(match_indices[:limit], result.shape)

    if len(matches[0]) == 0:
        if USE_IMAGE_NOT_FOUND_EXCEPTION:
            raise ImageNotFoundException('Could not locate the image (highest confidence = %.3f)' % result.max())
        else:
            return

    # use a generator for API consistency:
    matchx = matches[1] * step + region[0]  # vectorized
    matchy = matches[0] * step + region[1]
    for x, y in zip(matchx, matchy):
        yield Box(x, y, needleWidth, needleHeight)

def locate(needleImage, haystackImage, **kwargs):
    """
    TODO
    """
    # Note: The gymnastics in this function is because we want to make sure to exhaust the iterator so that the needle and haystack files are closed in locateAll.
    kwargs['limit'] = 1
    points = tuple(locateAll(needleImage, haystackImage, **kwargs))
    if len(points) > 0:
        return points[0]
    else:
        if USE_IMAGE_NOT_FOUND_EXCEPTION:
            raise ImageNotFoundException('Could not locate the image.')
        else:
            return None

if needleFileObj is not None:
                        needleFileObj.close()
                    if haystackFileObj is not None:
                        haystackFileObj.close()
                    return


    # There was no limit or the limit wasn't reached, but close the file handles anyway.
    if needleFileObj is not None:
        needleFileObj.close()
    if haystackFileObj is not None:
        haystackFileObj.close()

    if numMatchesFound == 0:
        if USE_IMAGE_NOT_FOUND_EXCEPTION:
            raise ImageNotFoundException('Could not locate the image.')
        else:
            return