Cannot import itk after installing itkwidgets

[ObliviousMonkey]

Hi,

I'm having an issue with itk 5.3.0 which prevents me from using itkwidgets (it fails at import), as there is a check in place which fails because itk attribute __version__ does not exist:

$ import itkwidgets

...

File /opt/homebrew/Caskroom/miniconda/base/envs/ai_med/lib/python3.9/site-packages/itkwidgets/integrations/itk.py:8
      6     import itk
      7     if not hasattr(itk, '__version__') or version.parse(itk.__version__) < version.parse('5.3.0'):
----> 8       raise RuntimeError('itk 5.3 or newer is required. `pip install itk>=5.3.0`')
      9     HAVE_ITK = True
     10 except ImportError:

RuntimeError: itk 5.3 or newer is required. `pip install itk>=5.3.0`

Upon investigating, this looks like an itkwidgets issue that seems to break itk.__version__ attribute upon installation.

I'm on macOS 13.2.1 (M1), and thus cannot install itk or itkwidgets through conda.

Reproducible environment:

$ conda create --name itk python=3.9
$ pip install itk   # installs 5.3.0

Successfully installed itk-5.3.0 itk-core-5.3.0 itk-filtering-5.3.0 itk-io-5.3.0 itk-numerics-5.3.0
itk-registration-5.3.0 itk-segmentation-5.3.0 numpy-1.24.2

Let's try at this point in the terminal:

$ python
Python 3.9.16 | packaged by conda-forge | (main, Feb  1 2023, 21:38:11)
[Clang 14.0.6 ] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import itk
>>> itk.__version__
'5.3.0'

Now let's install itkwidgets (here version 0.32.6):

$ pip install itkwidgets
...
Successfully installed Send2Trash-1.8.0 appnope-0.1.3 argon2-cffi-21.3.0 
argon2-cffi-bindings-21.2.0 asttokens-2.2.1 attrs-22.2.0 backcall-0.2.0 
beautifulsoup4-4.12.0 bleach-6.0.0 cffi-1.15.1 colorcet-3.0.1 comm-0.1.2 
contourpy-1.0.7 cycler-0.11.0 debugpy-1.6.6 decorator-5.1.1 defusedxml-0.7.1 
executing-1.2.0 fastjsonschema-2.16.3 fonttools-4.39.2 importlib-metadata-6.1.0 
importlib-resources-5.12.0 ipydatawidgets-4.3.2 ipykernel-6.22.0 ipympl-0.9.3 
ipython-8.11.0 ipython-genutils-0.2.0 ipywidgets-7.7.3 itk-meshtopolydata-0.10.0 
itkwidgets-0.32.6 jedi-0.18.2 jinja2-3.1.2 jsonschema-4.17.3 jupyter-client-8.1.0 
jupyter-core-5.3.0 jupyterlab-pygments-0.2.2 jupyterlab-widgets-1.1.2 
kiwisolver-1.4.4 markupsafe-2.1.2 matplotlib-3.7.1 matplotlib-inline-0.1.6 
mistune-2.0.5 nbclient-0.7.2 nbconvert-7.2.10 nbformat-5.8.0 nest-asyncio-1.5.6 
notebook-6.4.12 packaging-23.0 pandocfilters-1.5.0 param-1.13.0 parso-0.8.3 
pexpect-4.8.0 pickleshare-0.7.5 pillow-9.4.0 platformdirs-3.1.1 prometheus-client-0.16.0 
prompt-toolkit-3.0.38 psutil-5.9.4 ptyprocess-0.7.0 pure-eval-0.2.2 pycparser-2.21 
pyct-0.5.0 pygments-2.14.0 pyparsing-3.0.9 pyrsistent-0.19.3 python-dateutil-2.8.2 
pyzmq-25.0.2 six-1.16.0 soupsieve-2.4 stack-data-0.6.2 terminado-0.17.1 
tinycss2-1.2.1 tornado-6.2 traitlets-5.6.0 traittypes-0.2.1 wcwidth-0.2.6 
webencodings-0.5.1 widgetsnbextension-3.6.2 zipp-3.15.0 zstandard-0.20.0

And check again in the Python interpreter:

$ python
Python 3.9.16 | packaged by conda-forge | (main, Feb  1 2023, 21:38:11)
[Clang 14.0.6 ] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import itk
>>> itk.__version__
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: module 'itk' has no attribute '__version__'

Uninstalling itkwidgets through pip uninstall itkwidgets does not solve this at this point.

I've tried installing itkwidgets versions 0.32.6, 0.32.5, 0.32.4 with same results., as well as latest 1.0a24.