Reformatted all files with black and isort

[srittau]

A few comments between imports were removed or moved to the top of the
import block, due to behavioral differences between black and isort. See
psf/black#251 for details.

In two instances @overloads at the top of the file needed to be moved
due to psf/black#1490.

[srittau]

Now pytype fails. It was fine with the previous commit, but bails when moving the # type: ignore comments to the first line. Cc @rchen152

[JelleZijlstra]

Feel free to merge this as soon as CI passes.

Were you able to figure out what exactly pytype is choking on? It seems to be reporting errors for files that import the broken file, since some of the files that it complains about in CI have only whitespace changes. The problem looks to be somewhere in asyncio but I haven't been able to find out which file exactly.

[srittau]

The problem is only with the second commit, which only touches three files. I will see whether I can work around this later.

[rchen152]

Sorry, just saw this. At a glance, it looks like pytype doesn't expect a # type: ignore after the opening parenthesis in a function definition? I'll take a look.

[rchen152]

I pushed a pytype change to allow # type: ignore after the opening parenthesis in a function definition. (Sorry this issue keeps coming up! We've been wanting to fix our pyi parser for a long time, but there's always something more urgent to do...) If all goes well, a release containing this change should go out sometime next week.

[srittau]

Closing. I will open a new PR when the new pytest version is released. In the meantime, #4228 contains a few changes from this PR to address black and isort incompatibilities that will ease the Big Reformat.

[JelleZijlstra]

Looks like the pytype release hasn't gone out just yet.