# How to print a list of vertices' location and IDs using python?
**URL:** https://discourse.vtk.org/t/how-to-print-a-list-of-vertices-location-and-ids-using-python/965
**Category:** Support
**Created:** [May 15, 2019, 3:30am UTC](https://discourse.vtk.org/t/how-to-print-a-list-of-vertices-location-and-ids-using-python/965 "2019-05-15T03:30:49Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@Wenye\_He](https://discourse.vtk.org/u/Wenye_He)
#### Post date: [May 15, 2019, 3:30am UTC](https://discourse.vtk.org/t/how-to-print-a-list-of-vertices-location-and-ids-using-python/965/1 "2019-05-15T03:30:49Z")
Hello,
I am new to VTK.
I want to print a list of vertices’ location and IDs from an imported mesh.
For a list of vertices, I have to loop “GetPoint(i)”…?
For a list of IDs, “GetPointIds” return the list of point ids, but how to print the list of IDs.
What I got is vtkIdList…
Besides, how to use “PrintSelf”?
---
### Author:  [@jfavre](https://discourse.vtk.org/u/jfavre)
#### Post date: [May 15, 2019, 1:58pm UTC](https://discourse.vtk.org/t/how-to-print-a-list-of-vertices-location-and-ids-using-python/965/2 "2019-05-15T13:58:38Z")
It seems like you want a list of ids and coordinates as numpy arrays.
I would suggest the following:
from vtk.util import numpy\_support
pd=mesh.GetPointData()
ida=pd.GetGlobalIds()
nida=numpy\_support.vtk\_to\_numpy(ida)
coords = mesh.GetPoints().GetData()
ncoords = numpy\_support.vtk\_to\_numpy(coords)
ncoords and nida are numpy arrays. easy to view on your terminal.
HTH
---
### Author:  [@Wenye\_He](https://discourse.vtk.org/u/Wenye_He)
#### Post date: [May 15, 2019, 2:12pm UTC](https://discourse.vtk.org/t/how-to-print-a-list-of-vertices-location-and-ids-using-python/965/3 "2019-05-15T14:12:56Z")
I did my work by loops. Thanks for your suggestion. I am doing point2point registration. I modify the arrange and locations of the points in numpy array and replace those of copy of target mesh. Is there any document of numpy\_support for numpy\_to\_vtk?
---
### Author:  [@banesullivan](https://discourse.vtk.org/u/banesullivan)
#### Post date: [May 15, 2019, 6:30pm UTC](https://discourse.vtk.org/t/how-to-print-a-list-of-vertices-location-and-ids-using-python/965/4 "2019-05-15T18:30:27Z")
[PyVista](https://docs.pyvista.org) might be a library worth checking out - it creates a streamlined interface to the VTK Python bindings making tasks like this way simpler:
```python
import pyvista as pv
import numpy as np
# Load your file
mesh = pv.read('my_file.vtk')
# Access all the points
print(mesh.points)
```
Also note, we handle all the data conversions between VTK and NumPy for you. These can get complicated depending on your data type
```python
assert isinstance(mesh.points, np.ndarray)
```
For the IDs, we preserve the order of all data from the underlying VTK data object. The IDs would be the index along the 0th axis of the `mesh.points` numpy array:
```python
ids = np.arange(mesh.n_points, dtype=int)
print(ids)
```