Attempting to run the develop step for jupyter labextension not working

[efranzmann]

Hello, I'm trying to get the widget working on a couple different JupyterLab hubs and I'm running into a snag. When I try to run jupyter labextension develop ipyaladin --overwrite I get a FileNotFoundError because it appears to be looking in my current directory rather than where the widget is installed. I manually navigated to where the file system was storing my widgets and tried running it again. This time I got the following from the log file:

Traceback (most recent call last):

  File "/usr/local/lib/python3.6/dist-packages/jupyterlab/federated_labextensions.py", line 384, in _get_labextension_metadata
    package = subprocess.check_output([sys.executable, 'setup.py', '--name'], cwd=mod_path).decode('utf8').strip()

  File "/usr/lib/python3.6/subprocess.py", line 356, in check_output
    **kwargs).stdout

  File "/usr/lib/python3.6/subprocess.py", line 438, in run
    output=stdout, stderr=stderr)

subprocess.CalledProcessError: Command '['/usr/bin/python3', 'setup.py', '--name']' returned non-zero exit status 2.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):

  File "/usr/local/lib/python3.6/dist-packages/jupyterlab/debuglog.py", line 48, in debug_logging
    yield

  File "/usr/local/lib/python3.6/dist-packages/jupyterlab/labextensions.py", line 135, in start
    ans = self.run_task()

  File "/usr/local/lib/python3.6/dist-packages/jupyterlab/labextensions.py", line 207, in run_task
    symlink=self.symlink)

  File "/usr/local/lib/python3.6/dist-packages/jupyterlab/federated_labextensions.py", line 146, in develop_labextension_py
    m, labexts = _get_labextension_metadata(module)

  File "/usr/local/lib/python3.6/dist-packages/jupyterlab/federated_labextensions.py", line 387, in _get_labextension_metadata
    'it is missing the `setup.py` file.'.format(module))

FileNotFoundError: The Python package `ipyaladin` is not a valid package, it is missing the `setup.py` file.

Exiting application: lab

Can anyone give me any suggestions on how to get it working?

Thanks!

[ManonMarchand]

Oh I see that you use python 3.6. We don't support this, sorry. We usually try to work with the python versions that are not in end-of-life state, see here : https://devguide.python.org/versions/

As this looks like your system python, I can suggest to work in a virtual environment that'd run an other version (I personally use miniconda for that but there are a lot of other tools.)

Edit: It should solve your issue, but don't hesitate to come back if this not the case

[efranzmann]

Ah! Thank you. I don't run that particular hub but I will contact the admin. Thank you for your help!

[ManonMarchand]

(also you're welcome if you want to develop into ipyaladin, you'd be our first external contributor. We can talk if you need help)

Edit: ah no, the develop step, not the development installation, sorry