Try fading to black and other linters experiment

[webknjaz]

Hey @asvetlov, here's my experiment on standardizing linters + trying to bring black in place.

What do you think?

[webknjaz]

@asvetlov failures can be adjusted, but I need you to validate the idea.

[asvetlov]

Maybe apply black with default settings?
Otherwise I'd like to have make black command.
But strings normalization and 90 chars line length looks OK if applied consistently.
IIRC emacs can read line length for the project from config file.

[codecov]

Codecov Report

Merging #262 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master     #262   +/-   ##
=======================================
  Coverage   99.71%   99.71%           
=======================================
  Files           4        4           
  Lines         355      355           
=======================================
  Hits          354      354           
  Misses          1        1

Impacted Files	Coverage Δ
multidict/_abc.py	100% <ø> (ø)	⬆️
multidict/_multidict_py.py	99.68% <100%> (ø)	⬆️
multidict/__init__.py	100% <100%> (ø)	⬆️

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[webknjaz]

There's a number of other linters in pre-commit I'd like to keep and its config is quite a good place to consolidate options. We can try black with line-length arg, also I've applied ignore mode for quotes normalization.
make is not a cross-platform thing and the way it's used now is really harmful especially for new non-experienced contributors. I'm going to give tox another try a bit later. It could unify the CI experience and help contributors a lot.

[asvetlov]

The main library contributor is me.
I use Linux and found make very handy.
Pre-commit hook is perfect but I'd like to keep make tool.
Also, I don't use tox: it takes too long for building all possible environments.

[webknjaz]

I think you'd like to use tox the way I configure it: I'd run only your current python :)
It looks like I just need to show you better workflow with it.

Of course, we can wrap it all with make, I just want to untangle spaghetti there.
Also, think big: it's better to standardize tooling across all repos and in this case contributors matter.

I like GNU make, and I've used it for quite a while, but for the problem that I describe it's just not a right tool.

[webknjaz]

@asvetlov I've made a demo of how it might look like with tox-centric setup. It cleans up CI setup a bit and makes test runner truly cross-platform: #263

[rtd-helper]

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