* apply black and isort * move some type ignores
Reference: https://docs.python.org/3/library/doctest.html#doctest.DocTest.lineno Also noticed a typo in get_examples() argument name.
* complete doctest stub And merge it into 2and3 (the old stubs were virtually empty). * note things changed in 3.4 2.7 also had an undocumented and deprecated doctest.Tester class. I'm going to leave it out until somebody asks for it to be added.
