NameError: name '__version__' is not defined

[Loris Bennett]

Hi,

I have two applications.  One uses the system version of Python, which
is 3.6.8, whereas the other uses Python 3.10.8 installed in a non-system
path.  For both applications I am using poetry with a pyproject.toml
file which contains the version information and __init__.py at the root
which contains

  try:
      import importlib.metadata as importlib_metadata
  except ModuleNotFoundError:
      import importlib_metadata

  __version__ = importlib_metadata.version(__name__)
 
For the application with the system Python this mechanism works, but for
the non-system Python I get the error:
 
  NameError: name '__version__' is not defined

For the 3.6 application I have

  PYTHONPATH=/nfs/local/lib/python3.6/site-packages
  PYTHONUSERBASE=/nfs/local
  PYTHON_VERSION=3.6
  PYTHON_VIRTUALENV=

and for the 3.10 application I have

  PYTHONPATH=/nfs/easybuild/software/Python/3.10.8-GCCcore-12.2.0/easybuild/python:/nfs/local/lib/python3.10/site-packages
  PYTHONUSERBASE=/nfs/local
  PYTHON_VERSION=3.10
  PYTHON_VIRTUALENV=

The applications are installed in /nfs/local/lib/python3.6/site-packages
and /nfs/local/lib/python3.10/site-packages, respectively.

Can anyone see where this is going wrong?  I thought it should be
enough that the packages with the metadata is available via PYTHONPATH,
but this seems not to be sufficient.  So I must be overseeing something.

Cheers,

Loris

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