build: replace hatchling with the uv_build backend - #980
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Also migrates the license metadata to PEP 639 (`license` as an SPDX expression plus `license-files`), which is what uv_build reads to ship LICENSE inside the wheel. The resulting wheel is content-identical to the hatchling one.
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July 29, 2026 06:50
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Switches the build backend from `hatchling` to `uv_build`, replacing
`[tool.hatch.build.targets.sdist]` with `[tool.uv.build-backend]`. Only
`CHANGELOG.md` and `CONTRIBUTING.md` need an explicit `source-include` -
the module, `pyproject.toml`, README, and LICENSE are in the sdist by
default.
License metadata moves to PEP 639: `license = "Apache-2.0"` plus
`license-files = ["LICENSE"]`. That part is required, not cosmetic:
`uv_build` ships `LICENSE` inside the wheel only when it is declared via
`license-files`, and uv rejects `license-files` combined with the legacy
`license = { file = ... }` table.
The `License :: OSI Approved :: Apache Software License` classifier is
dropped because [PEP 639 deprecates license
classifiers](https://peps.python.org/pep-0639/#deprecate-license-classifiers)
in favor of `License-Expression`, which now carries the same information
("Using license classifier in the `Classifier` Core Metadata field is
deprecated and replaced by the more precise `License-Expression`
field"). See also the [core metadata
spec](https://packaging.python.org/en/latest/specifications/core-metadata/#license-expression).
uv warns about the classifier on every build.
Verified by building sdist + wheel before and after: the wheel contents
are identical, and the metadata differs only in `License-Expression:
Apache-2.0` replacing the inlined license text. The sdist drops
`.gitignore` and gains `pyproject.toml.orig` (uv 0.12 writes a TOML
1.0-compatible `pyproject.toml` into the sdist and keeps the original
alongside it). `uv.lock` is unchanged.
Part of the same sweep as apify/crawlee-python#2098,
apify/apify-sdk-python#1067, and apify/apify-client-python#980.
*✍️ Drafted by Claude Code*
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Switches the build backend from
hatchlingtouv_build, replacing the[tool.hatch.build.targets.*]config with[tool.uv.build-backend]. OnlyCHANGELOG.mdandCONTRIBUTING.mdneed an explicitsource-include- the module,pyproject.toml, README, and LICENSE are in the sdist by default.License metadata moves to PEP 639:
license = "Apache-2.0"pluslicense-files = ["LICENSE"]. That part is required, not cosmetic:uv_buildshipsLICENSEinside the wheel only when it is declared vialicense-files, and uv rejectslicense-filescombined with the legacylicense = { file = ... }table.The
License :: OSI Approved :: Apache Software Licenseclassifier is dropped because PEP 639 deprecates license classifiers in favor ofLicense-Expression, which now carries the same information ("Using license classifier in theClassifierCore Metadata field is deprecated and replaced by the more preciseLicense-Expressionfield"). See also the core metadata spec. uv warns about the classifier on every build.Verified by building sdist + wheel before and after: the wheel contents are identical, and the metadata differs only in
License-Expression: Apache-2.0replacing the inlined license text. The sdist drops.gitignoreand gainspyproject.toml.orig(uv 0.12 writes a TOML 1.0-compatiblepyproject.tomlinto the sdist and keeps the original alongside it).uv.lockis unchanged.✍️ Drafted by Claude Code