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This PR will add a pre-commit routine as outlined here. The effect will be, that whenever we execute
git commit -m ...
black and flake8 will check and format the code automatically.The configuration is such that the black formatting keeps the PEP8 line-length but there are some other very small differences (I don't know the details). If black really causes headaches, it can always be forced to be more faithful to PEP8.
I tested the pre-commit routine on ./bigbang/mailman.py. Thus there changes in that file are mainly because of black and because flak8 raised some warnings and errors.
New files:
./pre-commit-config.yaml
./pyproject.toml
./.flake8