py39-jupyterlab: jupyter_packaging version mismatch

[jsalort (Julien Salort)]

Jupyterlab refuses to launch due to jupyter_packaging version mismatch. I get the same result with jupyter-3.8 or jupyter-3.9. I don't know if it matters, but I selected the py39 version of all installed packages with port select.

% port version
Version: 2.6.4
% port installed "py39-jupyter*"
The following ports are currently installed:
  py39-jupyter @1.0.0_1 (active)
  py39-jupyter_client @6.1.12_0 (active)
  py39-jupyter_console @6.4.0_0 (active)
  py39-jupyter_core @4.7.1_0 (active)
  py39-jupyter_packaging @0.8.1_0 (active)
  py39-jupyter_server @1.5.1_0 (active)
  py39-jupyter_sphinx @0.3.2_0 (active)
  py39-jupyterlab @3.0.12_0 (active)
  py39-jupyterlab_pygments @0.1.2_0 (active)
  py39-jupyterlab_server @2.3.0_0
  py39-jupyterlab_server @2.4.0_0 (active)

Here is the result while trying to launch jupyter lab

% jupyter-3.9 lab
Traceback (most recent call last):
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/pkg_resources/__init__.py", line 568, in _build_master
    ws.require(__requires__)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/pkg_resources/__init__.py", line 886, in require
    needed = self.resolve(parse_requirements(requirements))
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/pkg_resources/__init__.py", line 777, in resolve
    raise VersionConflict(dist, req).with_context(dependent_req)
pkg_resources.ContextualVersionConflict: (jupyter-packaging 0.8.1 (/opt/local/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages), Requirement.parse('jupyter_packaging~=0.7.3'), {'jupyterlab'})

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.9/bin/jupyter-lab", line 33, in <module>
    sys.exit(load_entry_point('jupyterlab==3.0.12', 'console_scripts', 'jupyter-lab')())
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.9/bin/jupyter-lab", line 25, in importlib_load_entry_point
    return next(matches).load()
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/importlib/metadata.py", line 77, in load
    module = import_module(match.group('module'))
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1030, in _gcd_import
  File "<frozen importlib._bootstrap>", line 1007, in _find_and_load
  File "<frozen importlib._bootstrap>", line 972, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 228, in _call_with_frames_removed
  File "<frozen importlib._bootstrap>", line 1030, in _gcd_import
  File "<frozen importlib._bootstrap>", line 1007, in _find_and_load
  File "<frozen importlib._bootstrap>", line 986, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 680, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 790, in exec_module
  File "<frozen importlib._bootstrap>", line 228, in _call_with_frames_removed
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/jupyterlab/__init__.py", line 7, in <module>
    from .labapp import LabApp
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/jupyterlab/labapp.py", line 15, in <module>
    from jupyterlab_server import slugify, WORKSPACE_EXTENSION
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/jupyterlab_server/__init__.py", line 4, in <module>
    from .app import LabServerApp
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/jupyterlab_server/app.py", line 11, in <module>
    from .handlers import LabConfig, add_handlers
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/jupyterlab_server/handlers.py", line 19, in <module>
    from .translations_handler import TranslationsHandler
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/jupyterlab_server/translations_handler.py", line 16, in <module>
    from .translation_utils import get_language_pack, get_language_packs, is_valid_locale, translator
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/jupyterlab_server/translation_utils.py", line 15, in <module>
    import pkg_resources
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/pkg_resources/__init__.py", line 3243, in <module>
    def _initialize_master_working_set():
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/pkg_resources/__init__.py", line 3226, in _call_aside
    f(*args, **kwargs)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/pkg_resources/__init__.py", line 3255, in _initialize_master_working_set
    working_set = WorkingSet._build_master()
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/pkg_resources/__init__.py", line 570, in _build_master
    return cls._build_from_requirements(__requires__)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/pkg_resources/__init__.py", line 583, in _build_from_requirements
    dists = ws.resolve(reqs, Environment())
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/pkg_resources/__init__.py", line 772, in resolve
    raise DistributionNotFound(req, requirers)
pkg_resources.DistributionNotFound: The 'jupyter_packaging~=0.7.3' distribution was not found and is required by jupyterlab

Other jupyter commands, such as jupyter-3.9 console or jupyter-3.9 notebook do work:

% jupyter-3.9 console
Jupyter console 6.4.0

Python 3.9.4 (default, Apr  6 2021, 11:23:37) 
Type 'copyright', 'credits' or 'license' for more information
IPython 7.22.0 -- An enhanced Interactive Python. Type '?' for help.

In [1]: 

I am sure that it used to work, but I do not know when it stopped working. The installed version of jupyter_packaging is newer than the asked 0.7.3, so I do not know why jupyter lab complains. Except if it requires the one specific version ? In that case, the port file should block the version of jupyter_packaging somehow ?

[reneeotten (Renee Otten)]

this seems to be resolved -at least it works for me- after the update in this commit. Please test and if you still have trouble feel free to reopen this ticket.