Format code with black

[sliverc]

Fixes #857

Description of the Change

Format code with black.

There are no other code changes then just formatting of the code. I split up configuration and formatting into two different commits so we can still have a functioning blame.

Therefore PLEASE no squash commit on this PR when merging.

Issue which are not directly related to black I will follow up with other PRs:

• Introduce pre-commit and update contributing
• remove ignore of F405 error

Checklist

• PR only contains one change (considered splitting up PR)
• unit-test added
• documentation updated
• CHANGELOG.md updated (only for user relevant changes)
• author name in AUTHORS

[codecov]

Codecov Report

Merging #862 (0146890) into master (1e2594f) will not change coverage.
The diff coverage is 98.31%.

@@           Coverage Diff           @@
##           master     #862   +/-   ##
=======================================
  Coverage   97.74%   97.74%           
=======================================
  Files          60       60           
  Lines        3319     3319           
=======================================
  Hits         3244     3244           
  Misses         75       75           

Impacted Files	Coverage Δ
example/api/serializers/post.py	100.00% <ø> (ø)
example/migrations/0007_artproject_description.py	100.00% <ø> (ø)
.../tests/integration/test_non_paginated_responses.py	100.00% <ø> (ø)
example/tests/integration/test_pagination.py	100.00% <ø> (ø)
rest_framework_json_api/relations.py	88.40% <87.50%> (ø)
rest_framework_json_api/metadata.py	91.66% <88.46%> (ø)
rest_framework_json_api/renderers.py	90.18% <90.54%> (ø)
example/api/resources/identity.py	100.00% <100.00%> (ø)
example/api/serializers/identity.py	100.00% <100.00%> (ø)
example/factories.py	100.00% <100.00%> (ø)
... and 48 more

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[n2ygk]

Sorry it took me so long to get to this.

If you can make sure auto-generated files are not reformatted, that would be great. Otherwise we'll have a bunch unnecessary diffs.

[n2ygk]

can you add this to an exceptions file that black won't fix? conf.py is autogenerated by sphinx-quickstart and then edited manually after that.

[n2ygk]

As above, exclude migrations.

[n2ygk]

Also exclude auto-generated snapshots

[sliverc]

Thanks for having a look at this.

I deliberately formatted the generated files as well because:

• the Django Enhancement Proposal DEP-8 specifies it this way

All code Django generates will also be Black-formatted (startproject, migrations, inspectdb, etc.), at least if the user has Black installed.

• this allows us to enable linting on generated files as most of the generated files actually are edited by humans - this way human error can be minimized. (e.g. migrations can also have user input if a manual migration needs to be written).

Does this makes sense?