No module named 'traits._py2to3'

[steel3d]

I tried upgrading mayavi today (after using it all day). Can't use it anymore.

I upgraded to mayavi 4.7.1 and traits 6.1.1:

c:\Steve\p4>pip install --upgrade --user mayavi Requirement already up-to-date: mayavi in c:\users\steve\appdata\local\programs\python\python36\lib\site-packages (4.7.1) Requirement already satisfied, skipping upgrade: pyface>=6.1.1 in c:\users\steve\appdata\local\programs\python\python36\lib\site-packages (from mayavi) (7.0.1) Requirement already satisfied, skipping upgrade: pygments in c:\users\steve\appdata\local\programs\python\python36\lib\site-packages (from mayavi) (2.2.0) Processing c:\users\steve\appdata\local\pip\cache\wheels\25\73\54\c034c1b79c3bcac3102f82236ee7fe05e341cd9839ae94c07c\traits-6.1.1-cp36-cp36m-win_amd64.whl Requirement already satisfied, skipping upgrade: traitsui>=6.0.0 in c:\users\steve\appdata\local\programs\python\python36\lib\site-packages (from mayavi) (6.0.0) Requirement already satisfied, skipping upgrade: envisage in c:\users\steve\appdata\local\programs\python\python36\lib\site-packages (from mayavi) (4.7.1) Requirement already satisfied, skipping upgrade: vtk in c:\users\steve\appdata\local\programs\python\python36\lib\site-packages (from mayavi) (8.1.2) Requirement already satisfied, skipping upgrade: numpy in c:\users\steve\appdata\local\programs\python\python36\lib\site-packages (from mayavi) (1.18.4) Requirement already satisfied, skipping upgrade: apptools in c:\users\steve\appdata\local\programs\python\python36\lib\site-packages (from mayavi) (4.4.0) Requirement already satisfied, skipping upgrade: configobj in c:\users\steve\appdata\local\programs\python\python36\lib\site-packages (from apptools->mayavi) (5.0.6) Requirement already satisfied, skipping upgrade: six in c:\users\steve\appdata\local\programs\python\python36\lib\site-packages (from configobj->apptools->mayavi) (1.11.0) Installing collected packages: traits Successfully installed traits-6.1.1

I get an error on import:

c:\Steve\p4\py\pnet\pnet>python pnet.py Traceback (most recent call last): File "pnet.py", line 25, in <module> from mayavi import mlab File "C:\Users\Steve\AppData\Local\Programs\Python\Python36\lib\site-packages\mayavi\mlab.py", line 16, in <module> from mayavi.tools.camera import view, roll, yaw, pitch, move File "C:\Users\Steve\AppData\Local\Programs\Python\Python36\lib\site-packages\mayavi\tools\camera.py", line 24, in <module> from .engine_manager import get_engine File "C:\Users\Steve\AppData\Local\Programs\Python\Python36\lib\site-packages\mayavi\tools\engine_manager.py", line 12, in <module> from mayavi.preferences.api import preference_manager File "C:\Users\Steve\AppData\Local\Programs\Python\Python36\lib\site-packages\mayavi\preferences\api.py", line 4, in <module> from .preference_manager import preference_manager File "C:\Users\Steve\AppData\Local\Programs\Python\Python36\lib\site-packages\mayavi\preferences\preference_manager.py", line 29, in <module> from traitsui.api import View, Group, Item File "C:\Users\Steve\AppData\Local\Programs\Python\Python36\lib\site-packages\traitsui\api.py", line 31, in <module> from .editor import Editor File "C:\Users\Steve\AppData\Local\Programs\Python\Python36\lib\site-packages\traitsui\editor.py", line 51, in <module> from .item import Item File "C:\Users\Steve\AppData\Local\Programs\Python\Python36\lib\site-packages\traitsui\item.py", line 34, in <module> import traits._py2to3 as _py2to3 ModuleNotFoundError: No module named 'traits._py2to3'

[mdickinson]

It looks as though you're using an old version of TraitsUI. Can you try upgrading the traitsui package?

[steel3d]

Wow! Thanks for the quick response! That fixed it!

So I guess this requirement needs to be updated to a higher version?

"Requirement already satisfied, skipping upgrade: traitsui>=6.0.0"

[mdickinson]

Yes, I think it may make sense to update the dependencies to require TraitsUI 7.0 or later. @prabhuramachandran Opinions?

[prabhuramachandran]

Sure, I don't have a problem with that. Perhaps this should be done before the next Mayavi release.

[prabhuramachandran]

@mdickinson -- I am also going to bump the requirement for traits to be traits>=6.0.0, I guess that should be fine too right?

[prabhuramachandran]

This is now in the 4.7.2 release.

[mdickinson]

I am also going to bump the requirement for traits to be traits>=6.0.0

Sounds good to me!

[Roly83]

Hola tengo un problema al crear mi ejecutable para Windows estoy utilizando la biblioteca de Mayavi que me gusta mucho y me parece genial, pero me esta generando este error y no tengo idea de como solucionarlo Traceback (most recent call last): File "pyface\base_toolkit.py", line 219, in import_toolkit File "importlib\metadata__init.py", line 162, in load File "importlib\init__.py", line 126, in import_module File "", line 1050, in _gcd_import File "", line 1027, in _find_and_load File "", line 1004, in _find_and_load_unlocked ModuleNotFoundError: No module named 'traitsui.null'

The above exception was the direct cause of the following exception:

Traceback (most recent call last): File "Caver_Mapping3.py", line 14, in File "", line 1027, in _find_and_load File "", line 1006, in _find_and_load_unlocked File "", line 688, in _load_unlocked File "PyInstaller\loader\pyimod02_importers.py", line 352, in exec_module File "mayavi\mlab.py", line 16, in File "", line 1027, in _find_and_load File "", line 1006, in _find_and_load_unlocked File "", line 688, in _load_unlocked File "PyInstaller\loader\pyimod02_importers.py", line 352, in exec_module File "mayavi\tools\camera.py", line 24, in File "", line 1027, in _find_and_load File "", line 1006, in _find_and_load_unlocked File "", line 688, in _load_unlocked File "PyInstaller\loader\pyimod02_importers.py", line 352, in exec_module File "mayavi\tools\engine_manager.py", line 13, in File "", line 1027, in _find_and_load File "", line 1006, in _find_and_load_unlocked File "", line 688, in _load_unlocked File "PyInstaller\loader\pyimod02_importers.py", line 352, in exec_module File "mayavi\preferences\api.py", line 4, in File "", line 1027, in _find_and_load File "", line 1006, in _find_and_load_unlocked File "", line 688, in _load_unlocked File "PyInstaller\loader\pyimod02_importers.py", line 352, in exec_module File "mayavi\preferences\preference_manager.py", line 29, in File "", line 1027, in _find_and_load File "", line 1006, in _find_and_load_unlocked File "", line 688, in _load_unlocked File "PyInstaller\loader\pyimod02_importers.py", line 352, in exec_module File "traitsui\api.py", line 257, in File "", line 1027, in _find_and_load File "", line 1006, in _find_and_load_unlocked File "", line 688, in _load_unlocked File "PyInstaller\loader\pyimod02_importers.py", line 352, in exec_module File "traitsui\editors__init__.py", line 16, in File "", line 1027, in _find_and_load File "", line 1006, in _find_and_load_unlocked File "", line 688, in _load_unlocked File "PyInstaller\loader\pyimod02_importers.py", line 352, in exec_module File "traitsui\editors\api.py", line 96, in File "", line 1027, in _find_and_load File "", line 1006, in _find_and_load_unlocked File "", line 688, in _load_unlocked File "PyInstaller\loader\pyimod02_importers.py", line 352, in exec_module File "traitsui\editors\code_editor.py", line 21, in File "traitsui\editors\code_editor.py", line 32, in CodeEditor File "traits\trait_factory.py", line 40, in call File "traitsui\toolkit_traits.py", line 43, in ColorTrait File "traitsui\toolkit.py", line 110, in toolkit File "pyface\base_toolkit.py", line 294, in find_toolkit File "pyface\base_toolkit.py", line 231, in import_toolkit RuntimeError: No traitsui.toolkits plugin could be loaded for null