How to get volume and model in the scene in the python code？

Development
1

I loaded a volume, in the scene and created a model. Below the data tree structure you can see the data shown in the figure. i want to get them in python code,The following:
model = slicer.mrmlScene.GetNumberOfNodesByClass(“vtkMRMLModelHierarchyNode”)
volume = slicer.mrmlScene.GetNumberOfNodesByClass(“vtkMRMLVolumeHeaderlessStorageNode”)
Is it possible to do this, but I test seems to have some problems, can you solve it? Thank you!

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2

If you put a subject hierarchy tree widget into your module, you can get the current selection by calling currentItem().