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Ideally anything that you reject for should also be conveniently baked into the build system so that you can do things like `make validate` before pushing to save yourself the embarrassment.

A contributor is supposed to be following the coding guidelines of the project from the start. If they don't bother to do that, they absolutely should be rejected. Why is it hard to follow a consistent style?

Because just remembering all of PEP8's requirements (which are mostly unjustified) is a frustrating burden. Keeping a consistent style is one thing. Mandating adherence to PEP8 is way over the top.

Because the codebase shouldn't have one consistent style?