py-spyder: The 'mistune<2,>=0.8.1' distribution was not found and is required by nbconvert

[mf2k (Frank Schima)]

spyder is broken at runtime again:

$ spyder
Traceback (most recent call last):
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/pkg_resources/__init__.py", line 579, in _build_master
    ws.require(__requires__)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/pkg_resources/__init__.py", line 897, in require
    needed = self.resolve(parse_requirements(requirements))
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/pkg_resources/__init__.py", line 788, in resolve
    raise VersionConflict(dist, req).with_context(dependent_req)
pkg_resources.ContextualVersionConflict: (mistune 2.0.2 (/opt/local/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages), Requirement.parse('mistune<2,>=0.8.1'), {'nbconvert'})

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/opt/local/bin/spyder", line 33, in <module>
    sys.exit(load_entry_point('spyder==5.2.2', 'gui_scripts', 'spyder')())
  File "/opt/local/bin/spyder", line 25, in importlib_load_entry_point
    return next(matches).load()
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/importlib/metadata/__init__.py", line 171, in load
    module = import_module(match.group('module'))
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1050, in _gcd_import
  File "<frozen importlib._bootstrap>", line 1027, in _find_and_load
  File "<frozen importlib._bootstrap>", line 1006, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 688, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 883, in exec_module
  File "<frozen importlib._bootstrap>", line 241, in _call_with_frames_removed
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/spyder/app/start.py", line 50, in <module>
    from spyder.utils.external import lockfile
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/spyder/utils/external/lockfile.py", line 31, in <module>
    from spyder.utils.programs import is_spyder_process
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/spyder/utils/programs.py", line 28, in <module>
    import pkg_resources
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/pkg_resources/__init__.py", line 3247, in <module>
    def _initialize_master_working_set():
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/pkg_resources/__init__.py", line 3221, in _call_aside
    f(*args, **kwargs)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/pkg_resources/__init__.py", line 3259, in _initialize_master_working_set
    working_set = WorkingSet._build_master()
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/pkg_resources/__init__.py", line 581, in _build_master
    return cls._build_from_requirements(__requires__)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/pkg_resources/__init__.py", line 594, in _build_from_requirements
    dists = ws.resolve(reqs, Environment())
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/site-packages/pkg_resources/__init__.py", line 783, in resolve
    raise DistributionNotFound(req, requirers)
pkg_resources.DistributionNotFound: The 'mistune<2,>=0.8.1' distribution was not found and is required by nbconvert

$ port installed py310-nbconvert py310-mistune
The following ports are currently installed:
  py310-mistune @0.8.4_0
  py310-mistune @2.0.2_0 (active)
  py310-nbconvert @6.4.5_0 (active)

[reneeotten (Renee Otten)]

this is an issue with py-nbconvert after the update of py-mistune, which of course in the end trickles down to everything that depends on these ports (e.g., py-spyder).

[stromnov (Andrey Stromnov)]

In 3262d292c5510b0fe0b4cf9a78072d0525a31a9a/macports-ports (master):

py-mistune: revert to 0.8.4

Closes: #64935