Also flake8-comprehensions which was added to the CI For flake8-simplify, there are a few false-positives, e.g. https://github.com/MartinThoma/flake8-simplify/issues/115
Fix issues found by flake8-bugbear: * Unused loop variables * assert statements in non-test code * mixing test code with production code * mark one excessive test which takes ~10min to run as 'slow'
There are a lot of exceptions, but it's a start. This will ensure that no more issues get added / that issues get fixed before the code is added
