DeprecationWarning with importlib-metadata>=3.9.0

[domdfcoding]

importlib-metadata 3.6.0 changed the behaviour of entry_points() to no longer return a dictionary of entry points but instead return an object with a deprecated dict-like interface. As of importlib-metadata 3.9.0 a DeprecationWarning is emitted when calling the dictionary methods.

pytest-randomly calls .get() here:

pytest-randomly/src/pytest_randomly.py

Lines 151 to 156 in 1f0ef49

	if entrypoint_reseeds is None:
	entrypoint_reseeds = [
	e.load() for e in entry_points().get("pytest_randomly.random_seeder", [])
	]
	for reseed in entrypoint_reseeds:
	reseed(seed)

This results in the following warning:

venv/lib/python3.7/site-packages/pytest_randomly.py:153: DeprecationWarning: SelectableGroups dict interface is deprecated. Use select.
  e.load() for e in entry_points().get("pytest_randomly.random_seeder", [])

If warnings are turned into errors, this causes an internal error in pytest.

INTERNALERROR

(venv) domdf@ryzen:/tmp/pytest_randomly_deprecation$ PYTHONDEVMODE=1 PYTHONWARNINGS=error pytest test_foo.py
============================================================================================ test session starts ============================================================================================
platform linux -- Python 3.7.10, pytest-6.2.2, py-1.10.0, pluggy-0.13.1
INTERNALERROR> Traceback (most recent call last):
INTERNALERROR>   File "/tmp/pytest_randomly_deprecation/venv/lib/python3.7/site-packages/_pytest/main.py", line 267, in wrap_session
INTERNALERROR>     config.hook.pytest_sessionstart(session=session)
INTERNALERROR>   File "/tmp/pytest_randomly_deprecation/venv/lib/python3.7/site-packages/pluggy/hooks.py", line 286, in __call__
INTERNALERROR>     return self._hookexec(self, self.get_hookimpls(), kwargs)
INTERNALERROR>   File "/tmp/pytest_randomly_deprecation/venv/lib/python3.7/site-packages/pluggy/manager.py", line 93, in _hookexec
INTERNALERROR>     return self._inner_hookexec(hook, methods, kwargs)
INTERNALERROR>   File "/tmp/pytest_randomly_deprecation/venv/lib/python3.7/site-packages/pluggy/manager.py", line 87, in <lambda>
INTERNALERROR>     firstresult=hook.spec.opts.get("firstresult") if hook.spec else False,
INTERNALERROR>   File "/tmp/pytest_randomly_deprecation/venv/lib/python3.7/site-packages/pluggy/callers.py", line 208, in _multicall
INTERNALERROR>     return outcome.get_result()
INTERNALERROR>   File "/tmp/pytest_randomly_deprecation/venv/lib/python3.7/site-packages/pluggy/callers.py", line 80, in get_result
INTERNALERROR>     raise ex[1].with_traceback(ex[2])
INTERNALERROR>   File "/tmp/pytest_randomly_deprecation/venv/lib/python3.7/site-packages/pluggy/callers.py", line 187, in _multicall
INTERNALERROR>     res = hook_impl.function(*args)
INTERNALERROR>   File "/tmp/pytest_randomly_deprecation/venv/lib/python3.7/site-packages/_pytest/terminal.py", line 713, in pytest_sessionstart
INTERNALERROR>     config=self.config, startdir=self.startdir
INTERNALERROR>   File "/tmp/pytest_randomly_deprecation/venv/lib/python3.7/site-packages/pluggy/hooks.py", line 286, in __call__
INTERNALERROR>     return self._hookexec(self, self.get_hookimpls(), kwargs)
INTERNALERROR>   File "/tmp/pytest_randomly_deprecation/venv/lib/python3.7/site-packages/pluggy/manager.py", line 93, in _hookexec
INTERNALERROR>     return self._inner_hookexec(hook, methods, kwargs)
INTERNALERROR>   File "/tmp/pytest_randomly_deprecation/venv/lib/python3.7/site-packages/pluggy/manager.py", line 87, in <lambda>
INTERNALERROR>     firstresult=hook.spec.opts.get("firstresult") if hook.spec else False,
INTERNALERROR>   File "/tmp/pytest_randomly_deprecation/venv/lib/python3.7/site-packages/pluggy/callers.py", line 208, in _multicall
INTERNALERROR>     return outcome.get_result()
INTERNALERROR>   File "/tmp/pytest_randomly_deprecation/venv/lib/python3.7/site-packages/pluggy/callers.py", line 80, in get_result
INTERNALERROR>     raise ex[1].with_traceback(ex[2])
INTERNALERROR>   File "/tmp/pytest_randomly_deprecation/venv/lib/python3.7/site-packages/pluggy/callers.py", line 187, in _multicall
INTERNALERROR>     res = hook_impl.function(*args)
INTERNALERROR>   File "/tmp/pytest_randomly_deprecation/venv/lib/python3.7/site-packages/pytest_randomly.py", line 170, in pytest_report_header
INTERNALERROR>     _reseed(config)
INTERNALERROR>   File "/tmp/pytest_randomly_deprecation/venv/lib/python3.7/site-packages/pytest_randomly.py", line 153, in _reseed
INTERNALERROR>     e.load() for e in entry_points().get("pytest_randomly.random_seeder", [])
INTERNALERROR>   File "/tmp/pytest_randomly_deprecation/venv/lib/python3.7/site-packages/importlib_metadata/__init__.py", line 302, in get
INTERNALERROR>     flake8_bypass(self._warn)()
INTERNALERROR> DeprecationWarning: SelectableGroups dict interface is deprecated. Use select.

See python/importlib_metadata#278 and python/importlib_metadata#289 for more context.

This is currently only an issue on Python 3.7 and earlier, as pytest-randomly uses the standard library on newer versions.

[domdfcoding]

The changelog suggests https://pypi.org/project/backports.entry-points-selectable/ as a possible solution.

[adamchainz]

Fix released in version 3.6.0, thanks!