No module named 'tvtk.custom.light'

[Dharmesh946]

Hi.

I'm running Python 3.10.12 under ubuntu 22.04.
I installed mayavi through pip install mayavi, followed by pip3 install PyQt5

In any python script, on from mayavi import mlab I've got the following errors:

Exception has occurred: ValueError
numpy.dtype size changed, may indicate binary incompatibility. Expected 96 from C header, got 88 from PyObject
ModuleNotFoundError: No module named 'tvtk.custom.light'

During handling of the above exception, another exception occurred:

File "/.py", line 19, in
from mayavi import mlab
ValueError: numpy.dtype size changed, may indicate binary incompatibility. Expected 96 from C header, got 88 from PyObject

from pip freeze:

mayavi==4.8.2
numpy==2.0.2
PyQt5==5.15.11
vtk==9.4.1

Running mayavi2 also fails:

Traceback (most recent call last):
File "tvtk_classes/tvtk_helper.py", line 22, in get_module
ModuleNotFoundError: No module named 'tvtk.custom.light'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "<path_to_env>/bin/mayavi2", line 5, in
from mayavi.scripts.mayavi2 import main
File "<path_to_env>/lib/python3.10/site-packages/mayavi/scripts/mayavi2.py", line 462, in
from mayavi.plugins.app import Mayavi, setup_logger
File "<path_to_env>/lib/python3.10/site-packages/mayavi/plugins/app.py", line 19, in
from .mayavi_workbench_application import MayaviWorkbenchApplication
File "<path_to_env>/lib/python3.10/site-packages/mayavi/plugins/mayavi_workbench_application.py", line 17, in
import mayavi.api
File "<path_to_env>/lib/python3.10/site-packages/mayavi/api.py", line 2, in
from mayavi.core.engine import Engine
File "<path_to_env>/lib/python3.10/site-packages/mayavi/core/engine.py", line 27, in
from mayavi.core.base import Base
File "<path_to_env>/lib/python3.10/site-packages/mayavi/core/base.py", line 19, in
from tvtk.pyface.tvtk_scene import TVTKScene
File "<path_to_env>/lib/python3.10/site-packages/tvtk/pyface/tvtk_scene.py", line 25, in
from tvtk.pyface import light_manager
File "<path_to_env>/lib/python3.10/site-packages/tvtk/pyface/light_manager.py", line 130, in
class CameraLight(HasTraits):
File "<path_to_env>/lib/python3.10/site-packages/tvtk/pyface/light_manager.py", line 146, in CameraLight
source = Instance(tvtk.Light, ())
File "tvtk_classes/tvtk_helper.py", line 297, in
File "tvtk_classes/tvtk_helper.py", line 47, in get_class
File "tvtk_classes/tvtk_helper.py", line 28, in get_module
File "tvtk_classes/light.py", line 12, in
File "<path_to_env>/lib/python3.10/site-packages/tvtk/array_handler.py", line 29, in
from tvtk.array_ext import set_id_type_array
File "array_ext.pyx", line 1, in init array_ext
ValueError: numpy.dtype size changed, may indicate binary incompatibility. Expected 96 from C header, got 88 from PyObject

[lesbianlizard]

Same problem with mayavi 4.8.2 and numpy 2.2.3. Based on some stuff I read here, I tried downgrading numpy to version 1.26.4, which seems to be a functional workaround.