# Object address vs Python REPL output

**URL:** <https://discourse.slicer.org/t/object-address-vs-python-repl-output/1270>\
**Category:** Development\
**Created:** [October 23, 2017, 7:14pm UTC](https://discourse.slicer.org/t/object-address-vs-python-repl-output/1270 "2017-10-23T19:14:42Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![ihnorton](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/ihnorton/32/9_2.png) [@ihnorton](https://discourse.slicer.org/u/ihnorton)\
**Post date:** [October 23, 2017, 7:14pm UTC](https://discourse.slicer.org/t/object-address-vs-python-repl-output/1270/1 "2017-10-23T19:14:42Z")

</div>

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`)

```auto
>>> n=getNode("tissue")
>>> n
(vtkCommonCorePython.vtkMRMLModelNode)0x1307bea10
>>> n. __this__'_0000000132f20c50_p_vtkMRMLModelNode'
>>> print n
vtkMRMLModelNode (0x132f20c50)
  ID: vtkMRMLModelNode4
...

```

> **rest of output**
>
> ```auto
> 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
> 
> ```

---

<div class="post-metadata">

**Author:** ![jcfr](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/jcfr/32/17825_2.png) [@jcfr](https://discourse.slicer.org/u/jcfr)\
**Post date:** [October 23, 2017, 7:54pm UTC](https://discourse.slicer.org/t/object-address-vs-python-repl-output/1270/2 "2017-10-23T19:54:44Z")

</div>

> [@ihnorton](#):
>
> I guess it might be the PythonQt temporary for the string return, or maybe the constructor?

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

Update current environment:

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

```

Start Slicer python and try to reproduce:

```auto
>>> 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.

---

<div class="post-metadata">

**Author:** ![ihnorton](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/ihnorton/32/9_2.png) [@ihnorton](https://discourse.slicer.org/u/ihnorton)\
**Post date:** [October 23, 2017, 8:36pm UTC](https://discourse.slicer.org/t/object-address-vs-python-repl-output/1270/3 "2017-10-23T20:36:25Z")

</div>

Thanks, I see – it’s taking the [address of the proxy PyObject](https://github.com/Kitware/VTK/blob/master/Wrapping/PythonCore/PyVTKObject.cxx#L127). That’s a little confusing, but I only noticed because the addresses didn’t match what I saw in the debugger.