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We are using a pre-commit hook but I also have an on-save hook in my editor. Further, we also have a CI job that runs `black --check` which returns 1 (failing the build) if the files weren't completely formatted with black. In Go, the convention is that everyone's editor runs gofmt on change, and because the convention is so strong, that's usually enough (although many larger projects also have a CI job similar to the one described above).

Having used both extensively, my biggest grievances (in order) are that there aren't more editors that with good on-save support, that black is relatively slow (compared to gofmt), and that black isn't more opinionated and less configurable.

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