The program on line 35.

[100LocalMachine001]

Thank you for sharing this very useful program.
I have a question about the program on line 35 (input_img[top:top + h, left:left + w] = c).
When I run this line the variable is treated as mutable. Is this a problem in my implementation?

[HDUyiming]

如果使用官方中的这一行代码，我发现图像是没有任何变化的，请使用我提供的这条语句替换line35：
input_img[:, top:top + h, left:left + w] = c