python-OpenCV中使用漫水填充，遍历图像时报错，但是在C++程序中这样的遍历方式是没有错的，这样要怎么解决？

其中h和w是图像的长和宽

for i in range(h):
        for j in range(w):
           cv2.floodFill(copyImg,mask,(i,j),tuple(copyImg[i][j]*1.0),(5,5,5),(5,5,5),cv2.FLOODFILL_FIXED_RANGE)

error: OpenCV(4.3.0) C:\projects\opencv-python\opencv\modules\imgproc\src\floodfill.cpp:509: error: (-211:One of the arguments' values is out of range) Seed point is outside of image in function 'cv::floodFill'

在C++程序中，这样却是没有问题的

Mat mask(dst.rows + 2, dst.cols + 2, CV_8UC1, Scalar::all(0));
    for (int i = 0; i<dst.rows; i++)    
        for (int j = 0; j<dst.cols; j++)
            if (mask.at<uchar>(i + 1, j + 1) == 0)
            {
                Scalar newcolor(rng(256), rng(256), rng(256));
                floodFill(dst, mask, Point(j, i), newcolor, 0, Scalar::all(5), Scalar::all(5));
            }