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What I have done here is to enable the static code checks (flake8 and mypy) that are now available, and started addressing the simple weaknesses found.
There are still some more complex weaknesses such as Cyclomatic complexity too high, that I have not addressed and the adding of type hints, I have so far only done in the trivial cases. In any case, I consider this an improvement and I may continue the work (in this module or in other modules) at some other time.