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What is the purpose of this Pull Request?
Fix #546
What was done to achieve this purpose?
Run isort for all files (this makes files comply with PEP8)
How to test if it really works?
Just run the regular unit tests of the repo and see that nothing is broken
Who can help reviewing it?
Anyone who understands the repo
TODO
none
P.S.: I know this is a damn long PR. Please, let me know if you'd like me to break it and how I should partition it (: