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To verify a Python wheel’s contents, inspect the exact .whl you plan to publish, compare its complete archive listing against an explicit list of files your project should ship, and validate the hashes in its .dist-info/RECORD. The archive listing shows what is present; the expected-file comparison catches omissions and surprises; RECORD checks file integrity but cannot determine what your project intended to include.
Build the wheel you intend to publish
Inspect the built artifact rather than relying on the source tree. A build backend can transform or select files as it creates a wheel, so files visible in your checkout do not prove they will appear in the archive. The Python Packaging User Guide gives python3 -m build --wheel source-tree-directory as an example of building a wheel with the build frontend: Packaging Python Projects.
Use your project’s declared build backend and its normal release configuration. The official guidance recommends the build frontend and discourages direct setup.py command invocations; consult the current packaging guidance for modernizing setup.py projects if you need to update an older workflow.
Keep track of the output file you will actually upload. If you rebuild after reviewing it, the new wheel is a different artifact and needs its own inspection.
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List every path in the wheel archive
A wheel is a ZIP-format archive. Open the built .whl with a ZIP listing tool or Python’s zipfile interface, and retain the complete member-path listing. For example, this short script prints every archived path without extracting files:
from zipfile import ZipFile
wheel_path = "dist/example-1.0.0-py3-none-any.whl"
with ZipFile(wheel_path) as wheel:
for name in sorted(wheel.namelist()):
print(name)Replace wheel_path with the exact artifact under review. Save or otherwise retain the output so you can compare it with the intended contents and review the artifact again if needed. The packaging guide explains the distinction between wheel and source distribution contents: Python package formats.
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Compare the archive with an expected-file list
Prepare a project-specific list of paths that should be installed from the wheel. Include the runtime modules and packages, required package data, scripts, license files, and distribution metadata that apply to your project. Compare that list with the archive listing and investigate both missing expected paths and unanticipated members.
This comparison answers the practical question, “Did my package data make it into the wheel?” A source file’s presence in the repository is not sufficient: the built archive must contain the path your installation is supposed to provide. Wheels are intended to contain the files installed for a package, while source distributions commonly include tests and documentation that do not belong in the installed wheel.
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Do not treat every extra file as automatically wrong. Decide whether it is intentional for this project, then update the expected list or the build configuration accordingly. The key is having an explicit basis for distinguishing required contents from accidental omissions or inclusions.
Review wheel metadata and special directories
Alongside package files, review the wheel’s standardized directories and metadata. The wheel specification describes the archive layout, metadata files, tags, and installation-scheme directories: Binary distribution format.
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{distribution}-{version}.dist-info/contains distribution metadata. Review at leastMETADATA,WHEEL, andRECORD.{distribution}-{version}.data/, when present, holds files assigned to installation-scheme locations. Check that its contents and placement are expected.- Top-level installable modules and packages should match the paths your users are meant to import or install.
- Scripts have format-specific placement and requirements, so verify their paths against the wheel specification rather than assuming they sit beside package modules.
Use RECORD to check file integrity
RECORD is a CSV manifest containing wheel paths, hashes, and sizes. Under the wheel specification, each file other than RECORD must have a hash using SHA-256 or a stronger algorithm, and installers verify recorded hashes against file contents during extraction. Compare the paths in RECORD with the archive listing and validate the recorded digests for the files that have them.
A successful hash check is evidence that the files match the manifest; it is not proof that the manifest includes everything your project ought to ship. If a required module or data file was omitted when the wheel was built, RECORD cannot infer that it was intended. Use the expected-file comparison as a separate check.
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Inspect every wheel variant in the release
A release may include different wheels for different Python versions, ABIs, or platforms. Their filenames encode compatibility tags, and different variants can have different contents. Review each .whl independently rather than using one wheel’s inventory to stand in for all the others.
For each artifact, record its filename and compare its complete archive listing, expected-file match, metadata, and RECORD validation. The wheel specification documents the tag and layout rules in its binary distribution format specification.
Run Twine checks as a separate release check
twine check can validate distribution metadata and README rendering, but it does not establish that every intended runtime file is present in a wheel. Run it as an additional distribution check, not as a substitute for inspecting the archive and comparing its contents with your expected list. The packaging tutorial documents the check and upload flow: Packaging Python Projects.
Quick Recap
Pre-publish checklist
- Build the release wheel with the project’s declared backend and the
buildfrontend. - Identify the exact
.whlfile you will publish. - Print and retain the full ZIP member-path listing.
- Compare the paths with a project-specific expected-file list; resolve omissions and unexpected files.
- Review
.dist-info, any.datadirectory, scripts, and theMETADATA,WHEEL, andRECORDfiles. - Compare
RECORDpaths with the archive and validate recorded hashes. - Repeat the inspection for every wheel variant in the release.
- Run
twine checkseparately, then publish the same artifacts you inspected.
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