Formatting: fix long lines

[Glutexo]

Fixed the E501 Flake8 rule targetting too long lines. In most places, the code has been only reformatted. Sometimes a variable name has been shortened or another code-aware change has been made. I am not sure whether these changes don’t trigger another Flake8 rule. That should not be a big of an issue, since such cases should be rare and can be easily fixed.

I used a line length of 88 character, which is what Black uses by default.

In the app.config module I changed the import statement and replaced os.environ.get with an equivalent os.getenv.

In the api.metrics module I was targeting only the long lines, which results in not-unified code style. Improving the style and making it consistent would be a subject of another pull request.

This is a part of the first step towards a nicely formatted codebase. See #189, #335 and #331. It is currently the biggest pull request, but containing only trivial changes not affecting logic.

[catastrophe-brandon]

If memory serves, I think we chose to allow 100-char lines in the config for the test code. Personally, I think the 80 column limit is pretty restrictive. As far as I'm concerned, pick whatever line limit you like as long as we consistently enforce it.

Edit: Confirmed that we use a 100-char limit in our setup.cfg:

[flake8]
ignore = E128,E811,E999,W504
max-line-length = 100

[Glutexo]

Oh, thanks for clarifying. I was not sure whether @diegorafrh didn’t pick 100 just arbitrarily. It would be nice to document this in the README.

[Glutexo]

Extending the line length to 100 reduced the number of violating lines. Updated this pull request to use this value instead.

[diegorafrh]

@catastrophe-brandon is right, I did follow what IQE have implemented but I also thought a little bit more about it: #333 (review)

[Glutexo]

Based on @catastrophe-brandon ’s comment I increased the maximum line length to 119 characters. With the limit being this high, there was only one line that violates the rule. Moreover this line was formatted like that probably by mistake, because it was a really long chopped into pieces, separated by spaces "like " "this", but kept on a single line.