Object address vs Python REPL output

Development
1

What is the address (0x1307bea10) printed next to the object type below for the “basic” REPL output? I guess it might be the PythonQt temporary for the string return, or maybe the constructor? (clearly the real object address is 0x132f20c50)

>>> n=getNode("tissue")
>>> n
(vtkCommonCorePython.vtkMRMLModelNode)0x1307bea10
>>> n.__this__
'_0000000132f20c50_p_vtkMRMLModelNode'
>>> print n
vtkMRMLModelNode (0x132f20c50)
  ID: vtkMRMLModelNode4
...
rest of output 
  Debug: Off
  Modified Time: 1075109
  Name: tissue
  Description: (none)
  SingletonTag: (none)
  HideFromEditors: 0
  Selectable: 1
  Selected: 0
  Indent:      0
  Node references:
    display [displayNodeRef]: vtkMRMLModelDisplayNode5
    storage [storageNodeRef]: (none)
    transform [transformNodeRef]: (none)
  Debug: Off
  Modified Time: 1074628
  Reference Count: 1
  Registered Events: (none)
  Name = (none)
  RestoreSelectionState = 0
  TransformNodeID: (none)
  DisplayNodeIDs[0]: vtkMRMLModelDisplayNode5
  
Poly Data:
    Debug: Off
    Modified Time: 1073925
    Reference Count: 1
    Registered Events: (none)
    Information: 0x608000e7e280
    Data Released: False
    Global Release Data: Off
    UpdateTime: 1073926
    Field Data:
      Debug: Off
      Modified Time: 1073889
      Reference Count: 1
      Registered Events: (none)
      Number Of Arrays: 0
      Number Of Components: 0
      Number Of Tuples: 0
    Number Of Points: 5917
    Number Of Cells: 1570
    Cell Data:
      Debug: Off
      Modified Time: 1073897
      Reference Count: 1
      Registered Events: 
        Registered Observers:
          vtkObserver (0x608000e58180)
            Event: 33
            EventName: ModifiedEvent
            Command: 0x608000e7dc40
            Priority: 0
            Tag: 1
      Number Of Arrays: 0
      Number Of Components: 0
      Number Of Tuples: 0
      Copy Tuple Flags: ( 1 1 1 1 1 0 1 1 )
      Interpolate Flags: ( 1 1 1 1 1 0 0 1 )
      Pass Through Flags: ( 1 1 1 1 1 1 1 1 )
      Scalars: (none)
      Vectors: (none)
      Normals: (none)
      TCoords: (none)
      Tensors: (none)
      GlobalIds: (none)
      PedigreeIds: (none)
      EdgeFlag: (none)
    Point Data:
      Debug: Off
      Modified Time: 1073925
      Reference Count: 1
      Registered Events: 
        Registered Observers:
          vtkObserver (0x608000e57d60)
            Event: 33
            EventName: ModifiedEvent
            Command: 0x608000e7dc40
            Priority: 0
            Tag: 1
      Number Of Arrays: 1
      Array 0 name = Normals
      Number Of Components: 3
      Number Of Tuples: 5917
      Copy Tuple Flags: ( 1 1 1 1 1 0 1 1 )
      Interpolate Flags: ( 1 1 1 1 1 0 0 1 )
      Pass Through Flags: ( 1 1 1 1 1 1 1 1 )
      Scalars: (none)
      Vectors: (none)
      Normals: 
        Debug: Off
        Modified Time: 1073922
        Reference Count: 4
        Registered Events: (none)
        Name: Normals
        Data type: float
        Size: 17754
        MaxId: 17750
        NumberOfComponents: 3
        Information: 0
        Name: Normals
        Number Of Components: 3
        Number Of Tuples: 5917
        Size: 17754
        MaxId: 17750
        LookupTable: (none)
      TCoords: (none)
      Tensors: (none)
      GlobalIds: (none)
      PedigreeIds: (none)
      EdgeFlag: (none)
    Bounds: 
      Xmin,Xmax: (-35.2613, 36.24)
      Ymin,Ymax: (-46.4626, 19.3652)
      Zmin,Zmax: (-10.8084, -5.64577)
    Compute Time: 1101077
    Number Of Points: 5917
    Point Coordinates: 0x6000008ce620
    Locator: 0
    Number Of Vertices: 0
    Number Of Lines: 0
    Number Of Polygons: 0
    Number Of Triangle Strips: 1570
    Number Of Pieces: 1
    Piece: 0
    Ghost Level: 0
2

Base one this experiment, look like this is specific to VTK wrapping:

Update current environment:

eval $(./Slicer --launcher-show-set-environment-commands)

Start Slicer python and try to reproduce:

>>> import mrml
>>> n = mrml.vtkMRMLModelNode()
>>> n
(vtkCommonCorePython.vtkMRMLModelNode)0x7fe119235db8
>>> n.__this__
'_0000000002476cc0_p_vtkMRMLModelNode'
>>> print(n)
vtkMRMLModelNode (0x2476cc0)
  ID: (none)
  Class: vtkMRMLModelNode
  Debug: Off
  Modified Time: 73
  Name: (none)
  Description: (none)
  SingletonTag: (none)
  HideFromEditors: 0
  Selectable: 1
  Selected: 0
  Node references:
    display [displayNodeRef]: (none)
    storage [storageNodeRef]: (none)
    transform [transformNodeRef]: (none)
  Debug: Off
  Modified Time: 75
  Reference Count: 1
  Registered Events: (none)
  Name = (none)
  RestoreSelectionState = 0
  TransformNodeID: (none)
  
Unstructured Grid: none  
Poly Data: none

Addresses are different outside of the PythonQt environment.

I suggest you bring the issue on the VTK mailing list.

3

Thanks, I see – it’s taking the address of the proxy PyObject. That’s a little confusing, but I only noticed because the addresses didn’t match what I saw in the debugger.