Fix flake8 issues found in CI/CD #20
Description
At the moment there are a bunch of issues present in the CI/CD related to the flake8 stage, the results of which are also currently being ignored, black has been run over the repository, so the code is fairly clean, but black does not format docstrings, which is where the issues exist. Once the issues have been fixed, the stage could then be toggled on, so that in the future all code has to comply, which would be great.