AbstractEventLoop missing methods from 3.4.2 and up.

[fried]

create_future, create_task, set_task_factory, get_task_factory

[ambv]

This is adding a few methods that were added in 3.5.2, 3.4.2, and 3.4.4. The correct way to add them would be to add the sys.version_info checks with a three-tuple but Mypy only supports a 'x.y' format in specifying the Python version. In this case, I'd rather use a two-tuple, which while technically incorrect, it's more pragmatically useful.

@gvanrossum, @JukkaL, how have you been solving this before?

[gvanrossum]

FWIW my recommendation is to just pretend that all versions of 3.x work like the most recent 3.x.y. In fact, despite the theoretical problem with this, that's probably more useful than changing mypy to support 3-digit versions, since we'd have some ambiguity around what e.g. --python-version 3.4 should mean -- would that be 3.4.0 or 3.4.y for the highest possible version of y? Note that there may be code like this:

if sys.version_info > (3, 4):
    ...

Would that mean 3.4.1 and up, or 3.5 and up? So maybe my suggestion from gitter to support 3-digit versions is best ignored.

[ambv]

I will add a linter warning against using three-tuples in sys.version_info checks.