eliminate warnings from DefinedNamespace which occurs as a consequence of pytest and sphinx

[aucampia]

This is maybe not a bug exactly but it is annoying. When building sphinx we get the following warnings:

pytest:

  .tox/py37-extensive/lib/python3.7/site-packages/_pytest/fixtures.py:228
    /home/runner/work/rdflib/rdflib/.tox/py37-extensive/lib/python3.7/site-packages/_pytest/fixtures.py:228: UserWarning: Code: _pytestfixturefunction is not defined in namespace DCAT
      obj, "_pytestfixturefunction", None

sphinx:

/home/docs/.asdf/installs/python/3.7.12/lib/python3.7/inspect.py:2250: UserWarning: Code: _partialmethod is not defined in namespace DCAT

Not sure what the best strategy is to fix it, one option is to just always raise AttributeError for these attributes, but I'm not sure this is entirely right either, as it seems to be somewhat over fitting/pinning to the problem, there may be a more general solution which is sensible, maybe there is some way to mark the class/metaclass to prevent this.

This is really low priority as it does not break anything, but I thought I would record it anyway just as a mental note.

More details:

https://readthedocs.org/projects/rdflib/builds/16667234/

$ /home/docs/checkouts/readthedocs.org/user_builds/rdflib/envs/1825/bin/python -m sphinx -T -E -W --keep-going -b html -d _build/doctrees -D language=en . _build/html
...(elided)...
The HTML pages are in _build/html.
Updating searchtools for Read the Docs search... /home/docs/.asdf/installs/python/3.7.12/lib/python3.7/inspect.py:2250: UserWarning: Code: _partialmethod is not defined in namespace BRICK
  partialmethod = obj._partialmethod
/home/docs/.asdf/installs/python/3.7.12/lib/python3.7/inspect.py:2250: UserWarning: Code: _partialmethod is not defined in namespace DCAT
  partialmethod = obj._partialmethod
/home/docs/.asdf/installs/python/3.7.12/lib/python3.7/inspect.py:2250: UserWarning: Code: _partialmethod is not defined in namespace PROF
  partialmethod = obj._partialmethod
/home/docs/.asdf/installs/python/3.7.12/lib/python3.7/inspect.py:2250: UserWarning: Code: _partialmethod is not defined in namespace SDO
  partialmethod = obj._partialmethod
/home/docs/.asdf/installs/python/3.7.12/lib/python3.7/inspect.py:2250: UserWarning: Code: _partialmethod is not defined in namespace SOSA
  partialmethod = obj._partialmethod
/home/docs/.asdf/installs/python/3.7.12/lib/python3.7/inspect.py:2250: UserWarning: Code: _partialmethod is not defined in namespace SSN
  partialmethod = obj._partialmethod
/home/docs/.asdf/installs/python/3.7.12/lib/python3.7/inspect.py:2250: UserWarning: Code: _partialmethod is not defined in namespace TIME
  partialmethod = obj._partialmethod
/home/docs/.asdf/installs/python/3.7.12/lib/python3.7/inspect.py:2250: UserWarning: Code: _partialmethod is not defined in namespace XSD
  partialmethod = obj._partialmethod

https://github.com/RDFLib/rdflib/runs/6046502650?check_suite_focus=true

$ /home/runner/work/rdflib/rdflib/.tox/py37-extensive/bin/python -m pytest --cov --cov-report=
...(elided)...
  =============================== warnings summary ===============================
  .tox/py37-extensive/lib/python3.7/site-packages/_pytest/fixtures.py:228
    /home/runner/work/rdflib/rdflib/.tox/py37-extensive/lib/python3.7/site-packages/_pytest/fixtures.py:228: UserWarning: Code: _pytestfixturefunction is not defined in namespace XSD
      obj, "_pytestfixturefunction", None
  
  .tox/py37-extensive/lib/python3.7/site-packages/_pytest/fixtures.py:228
    /home/runner/work/rdflib/rdflib/.tox/py37-extensive/lib/python3.7/site-packages/_pytest/fixtures.py:228: UserWarning: Code: _pytestfixturefunction is not defined in namespace BRICK
      obj, "_pytestfixturefunction", None
  
  .tox/py37-extensive/lib/python3.7/site-packages/_pytest/fixtures.py:228
    /home/runner/work/rdflib/rdflib/.tox/py37-extensive/lib/python3.7/site-packages/_pytest/fixtures.py:228: UserWarning: Code: _pytestfixturefunction is not defined in namespace DCAT
      obj, "_pytestfixturefunction", None
  
  .tox/py37-extensive/lib/python3.7/site-packages/_pytest/fixtures.py:228
    /home/runner/work/rdflib/rdflib/.tox/py37-extensive/lib/python3.7/site-packages/_pytest/fixtures.py:228: UserWarning: Code: _pytestfixturefunction is not defined in namespace PROF
      obj, "_pytestfixturefunction", None
  
  .tox/py37-extensive/lib/python3.7/site-packages/_pytest/fixtures.py:228
    /home/runner/work/rdflib/rdflib/.tox/py37-extensive/lib/python3.7/site-packages/_pytest/fixtures.py:228: UserWarning: Code: _pytestfixturefunction is not defined in namespace SDO
      obj, "_pytestfixturefunction", None
  
  .tox/py37-extensive/lib/python3.7/site-packages/_pytest/fixtures.py:228
    /home/runner/work/rdflib/rdflib/.tox/py37-extensive/lib/python3.7/site-packages/_pytest/fixtures.py:228: UserWarning: Code: _pytestfixturefunction is not defined in namespace SOSA
      obj, "_pytestfixturefunction", None
  
  .tox/py37-extensive/lib/python3.7/site-packages/_pytest/fixtures.py:228
    /home/runner/work/rdflib/rdflib/.tox/py37-extensive/lib/python3.7/site-packages/_pytest/fixtures.py:228: UserWarning: Code: _pytestfixturefunction is not defined in namespace SSN
      obj, "_pytestfixturefunction", None
  
  .tox/py37-extensive/lib/python3.7/site-packages/_pytest/fixtures.py:228
    /home/runner/work/rdflib/rdflib/.tox/py37-extensive/lib/python3.7/site-packages/_pytest/fixtures.py:228: UserWarning: Code: _pytestfixturefunction is not defined in namespace TIME
      obj, "_pytestfixturefunction", None
  
  .tox/py37-extensive/lib/python3.7/site-packages/_pytest/fixtures.py:228
    /home/runner/work/rdflib/rdflib/.tox/py37-extensive/lib/python3.7/site-packages/_pytest/fixtures.py:228: UserWarning: Code: _pytestfixturefunction is not defined in namespace DFNSDefaults
      obj, "_pytestfixturefunction", None
  
  .tox/py37-extensive/lib/python3.7/site-packages/_pytest/fixtures.py:228
    /home/runner/work/rdflib/rdflib/.tox/py37-extensive/lib/python3.7/site-packages/_pytest/fixtures.py:228: UserWarning: Code: _pytestfixturefunction is not defined in namespace DFNSDefaultsEmpty
      obj, "_pytestfixturefunction", None
  
  .tox/py37-extensive/lib/python3.7/site-packages/_pytest/fixtures.py:228
    /home/runner/work/rdflib/rdflib/.tox/py37-extensive/lib/python3.7/site-packages/_pytest/fixtures.py:228: UserWarning: Code: _pytestfixturefunction is not defined in namespace DFNSWarnNoFail
      obj, "_pytestfixturefunction", None

[aucampia]

It should be noted that these warnings also occur when running pydoc/help:

$ pipx run --spec git+https://github.com/RDFLib/rdflib.git@master#egg=rdflib python -m pydoc rdflib 2>&1 >/dev/null | head
⚠️  python is already on your PATH and installed at /usr/bin/python.
    Downloading and running anyway.
/usr/lib64/python3.10/inspect.py:2426: UserWarning: Code: _partialmethod is not defined in namespace BRICK
  partialmethod = obj._partialmethod
/usr/lib64/python3.10/pydoc.py:312: UserWarning: Code: _fields is not defined in namespace BRICK
  fields = getattr(object, '_fields', [])
https://brickschema.org/schema/Brick#AED =  does not look like a valid URI, trying to serialize this will break.
https://brickschema.org/schema/Brick#AED = rdflib.term.URIRef('https://brickschema.org/schema/Brick#https://brickschema.org/schema/Brick#AED') does not look like a valid URI, trying to serialize this will break.
https://brickschema.org/schema/Brick#AHU =  does not look like a valid URI, trying to serialize this will break.
https://brickschema.org/schema/Brick#AHU = rdflib.term.URIRef('https://brickschema.org/schema/Brick#https://brickschema.org/schema/Brick#AHU') does not look like a valid URI, trying to serialize this will break.

[aucampia]

• See also https://github.com/RDFLib/rdflib/issues/1972

[ajnelson-nist]

The _pytestfixturefunction warning is also raised when running pytest using the TIME namespace.

[Markus92]

site-packages\_pytest\compat.py:328: UserWarning: Code: _pytestfixturefunction is not defined in namespace DCAT

Also raised there.