[python] Usage of HiddenLineDrawing class example?

@ivelin.peychev wrote:

Hi How should I use this when it’s a sealed class?

I tried to derive it and I get an error:

When I tried it differently I get a result None:

image.png1380×656 36.5 KB

Update:
ignore the typo with the Flatten, the result is the same even if it is: drw_params.Flatten = True

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