Find a way to filter concept exercises by taskno from the command line (concept exercises)

Start by reading the pytest mark usage and the conftest functions mentioned in the issue, then reproduce the task selection problem with a concept exercise. Investigate how pytest exposes marker arguments from the command line. Done means users can select tests by the numeric taskno without relying on pytest -k and without selecting unrelated tests.

Hi,
Pytest test suites in Exercism contain custom marks in the form of @pytest.mark.task(taskno=X) where X is a whole number. At least in concept exercises, this number corresponds to the task inside the supplied README file.
While doing a concept exercise, I wanted to select pytest tests to run and filter them by this taskno parameter but failed to do so. What I tried:

1. @BethanyG sent me a link to StackOverflow thread which shows one similar problem:

However, the example code allows to run marks with arguments looking like this:
@pytest.mark.task("taskno1")

Perhaps there is a way to modify something in the conftest functions but I haven't wrapped my head around it.

2. I tried a plugin called pytest-pilot

It supplies easier syntax for solving similar problems as 1 but also didn't help me solve the problem. I would get an error IndexError: tuple index out of range.

What I use now:

1. pytest -k keyword_you_need
   It usually works, but sometimes I still select more of fewer tests than needed
2. pytest --tb=short
   I don't like long error messages from pytests so this is another way to limit pytest from adding too much unwanted output.

Filtering by task number would be "nice to have", but I think solving this problem is interesting in itself. All help is welcome :)