INTERNALERROR> AttributeError: 'XshFunction' object has no attribute 'get_marker'

[andry81]

As suggested here:
https://stackoverflow.com/questions/54254337/pytest-attributeerror-function-object-has-no-attribute-get-marker/54254338#54254338

See pytest-dev/pytest#4564

Remove Node.get_marker(name) the return value was not usable for more than a existence check.

Use Node.get_closest_marker(name) as a replacement.

Remove testfunction.markername attributes - use Node.iter_markers(name=None) to iterate them.

I've tried to patch but it raise another error:

c:\python\x86\38\lib\site-packages\_pytest\mark\structures.py:321: PytestUnknownMarkWarning: Unknown pytest.mark.mp_group_info - is this a typo?  You can register custom marks to a
void this warning - for details, see https://docs.pytest.org/en/latest/mark.html
  warnings.warn(
There should be 17 tests run.
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "c:\python\x86\38\lib\multiprocessing\spawn.py", line 116, in spawn_main
    exitcode = _main(fd, parent_sentinel)
  File "c:\python\x86\38\lib\multiprocessing\spawn.py", line 126, in _main
    self = reduction.pickle.load(from_parent)
ModuleNotFoundError: No module named 'pytest_mp'

I've using this marker as introduced in an example:

@pytest.mark.mp_group('proc_isolated', 'free')
def test_foo():
  ...

I am using the xonsh module and tests in files with .xsh registered extension.

I need a per test isolated processes to avoid globals data merge.
Could it be fixed?

Update:
I've found the partial answer: #19

I did rewrite the installed pytest-mp module by sources from the master branch of the github but got hit with another error output:

collected 17 items
c:\python\x86\38\lib\site-packages\_pytest\mark\structures.py:321: PytestUnknownMarkWarning: Unknown pytest.mark.mp_group_info - is this a typo?  You can register custom marks to a
void this warning - for details, see https://docs.pytest.org/en/latest/mark.html
  warnings.warn(
There should be 17 tests run.
INTERNALERROR> Traceback (most recent call last):
INTERNALERROR>   File "c:\python\x86\38\lib\site-packages\_pytest\main.py", line 193, in wrap_session
INTERNALERROR>     session.exitstatus = doit(config, session) or 0
INTERNALERROR>   File "c:\python\x86\38\lib\site-packages\_pytest\main.py", line 237, in _main
INTERNALERROR>     config.hook.pytest_runtestloop(session=session)
INTERNALERROR>   File "c:\python\x86\38\lib\site-packages\pluggy\hooks.py", line 286, in __call__
INTERNALERROR>     return self._hookexec(self, self.get_hookimpls(), kwargs)
INTERNALERROR>   File "c:\python\x86\38\lib\site-packages\pluggy\manager.py", line 92, in _hookexec
INTERNALERROR>     return self._inner_hookexec(hook, methods, kwargs)
INTERNALERROR>   File "c:\python\x86\38\lib\site-packages\pluggy\manager.py", line 83, in <lambda>
INTERNALERROR>     self._inner_hookexec = lambda hook, methods, kwargs: hook.multicall(
INTERNALERROR>   File "c:\python\x86\38\lib\site-packages\pluggy\callers.py", line 208, in _multicall
INTERNALERROR>     return outcome.get_result()
INTERNALERROR>   File "c:\python\x86\38\lib\site-packages\pluggy\callers.py", line 80, in get_result
INTERNALERROR>     raise ex[1].with_traceback(ex[2])
INTERNALERROR>   File "c:\python\x86\38\lib\site-packages\pluggy\callers.py", line 187, in _multicall
INTERNALERROR>     res = hook_impl.function(*args)
INTERNALERROR>   File "c:\python\x86\38\lib\site-packages\pytest_mp\plugin.py", line 358, in pytest_runtestloop
INTERNALERROR>     run_batched_tests(batches, session, num_processes)
INTERNALERROR>   File "c:\python\x86\38\lib\site-packages\pytest_mp\plugin.py", line 272, in run_batched_tests
INTERNALERROR>     submit_test_to_process(test, session)
INTERNALERROR>   File "c:\python\x86\38\lib\site-packages\pytest_mp\plugin.py", line 204, in submit_test_to_process
INTERNALERROR>     proc.start()
INTERNALERROR>   File "c:\python\x86\38\lib\multiprocessing\process.py", line 121, in start
INTERNALERROR>     self._popen = self._Popen(self)
INTERNALERROR>   File "c:\python\x86\38\lib\multiprocessing\context.py", line 224, in _Popen
INTERNALERROR>     return _default_context.get_context().Process._Popen(process_obj)
INTERNALERROR>   File "c:\python\x86\38\lib\multiprocessing\context.py", line 326, in _Popen
INTERNALERROR>     return Popen(process_obj)
INTERNALERROR>   File "c:\python\x86\38\lib\multiprocessing\popen_spawn_win32.py", line 93, in __init__
INTERNALERROR>     reduction.dump(process_obj, to_child)
INTERNALERROR>   File "c:\python\x86\38\lib\multiprocessing\reduction.py", line 60, in dump
INTERNALERROR>     ForkingPickler(file, protocol).dump(obj)
INTERNALERROR> AttributeError: Can't pickle local object 'ArgumentParser.__init__.<locals>.identity'

============================================================================== no tests ran in 0.54s ==============================================================================
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "c:\python\x86\38\lib\multiprocessing\spawn.py", line 116, in spawn_main
    exitcode = _main(fd, parent_sentinel)
  File "c:\python\x86\38\lib\multiprocessing\spawn.py", line 126, in _main
    self = reduction.pickle.load(from_parent)
EOFError: Ran out of input
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "c:\python\x86\38\lib\multiprocessing\spawn.py", line 116, in spawn_main
    exitcode = _main(fd, parent_sentinel)
  File "c:\python\x86\38\lib\multiprocessing\spawn.py", line 126, in _main
    self = reduction.pickle.load(from_parent)
ModuleNotFoundError: No module named 'pytest_mp'

Update2:
I did downgrade from python x86 3.8.0 to python x86 3.5.3 and found that the error output is slightly different:

INTERNALERROR> Traceback (most recent call last):
INTERNALERROR>   File "c:\python\x86\35\lib\site-packages\_pytest\main.py", line 193, in wrap_session
INTERNALERROR>     session.exitstatus = doit(config, session) or 0
...
INTERNALERROR>   File "c:\python\x86\35\lib\multiprocessing\popen_spawn_win32.py", line 66, in __init__
INTERNALERROR>     reduction.dump(process_obj, to_child)
INTERNALERROR>   File "c:\python\x86\35\lib\multiprocessing\reduction.py", line 59, in dump
INTERNALERROR>     ForkingPickler(file, protocol).dump(obj)
INTERNALERROR> _pickle.PicklingError: Can't pickle <class 'module'>: attribute lookup module on builtins failed