What's the best organized modern open-source Python codebase you know?

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What are some of the most useful tools available today for improving and maintaining the quality of a Python codebase?

Building https://getmocha.com // creator of the https://blockchainsmokers.xyz

I love `black`! It's the gofmt/rustfmt of Python.

Is `pipenv` better than the built-in `venv`?

I personally like opinionated linters (so black) + pipenv for deps management (I know poetry has also gained in popularity for that).