re:
> Pylint raise warnings, because dict is oldstyle class.

This is solved by ``collections.MutableMapping`` class (FYI).

Also remember, subtest and sub-subtest base-classes are totally ignorant about ``stuff`` and ``sub_stuff``. However, that doesn't mean another class/instance hanging off the side (i.e. tooling attribute) can't make use of it :)  Also no reason references to callable things can't be stored there either :smile: