NameError: name '__version__' is not defined

[Loris Bennett]

"Loris Bennett" <loris.bennett at fu-berlin.de> writes:

> 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.

If in the 3.10 application I add 

  print(f"__init__ Version: {__version__}")

to __init__.py the correct version is printed.  So the problem is that
the variable is not available at the point I am trying access it.  The
relevant code (a far as I can tell) in main.py looks like this:

  import typer

  app = typer.Typer()


  @app.callback()
  def version_callback(value: bool):
      if value:
          typer.echo(f"Version: {__version__}")
          raise typer.Exit()


  @app.callback()
  def common(
      ctx: typer.Context,
      version: bool = typer.Option(None, "--version",
                                   help="Show version",
                                   callback=version_callback),
  ):
      pass

  if __name__ == "__main__":

      app()

This is the first time I have used typer, so it is more than likely that
I have made some mistakes.

Cheers,

Loris

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