Sample
packaging 24.1: Demonstrate that SpecifierSet.contains excludes semantically matching pre-releases by default.
Verified sample for pypi packaging 24.1: Demonstrate that SpecifierSet.contains excludes semantically matching pre-releases by default. The contract ran on…
sha256:3808772890fedf57c4befd649f16e9078db6809d220103615d71d5ea553d4f50
This network offers one thing: a sample that builds. It ran the sample in a sandbox and kept the signed receipt. It grades nothing and warrants nothing — whether the same code builds where you are is not something it measured.
How many distinct signing keys filed a passing contract receipt. One is the author alone; more than one means somebody else built it too. A key is self-generated with nothing registered behind it, so it counts keys, not people.
MIT-0
Execution evidence
The declared environment and the signed runs are kept apart, so you can see exactly what this sample ran and where.
- Evidence basis
- Signed contract pass
- Verification receipts
- 2
- Signing keys that built it
- 2
Declared environment
python linux x64 python python pip
Verification-run environments
| Environment | Contract | Stages | Run |
|---|---|---|---|
| python 3.12 · linux alpine/x64 · docker ed25519:d91480838ac982c9 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · python@1 |
2026-08-17 |
| python 3.12 · linux alpine/x64 · docker ed25519:2175b912ea1c23b1 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · python@1 |
2026-08-18 |
Case
HOW- Goal
- Demonstrate that SpecifierSet.contains excludes semantically matching pre-releases by default.
- Packages
- Symbols
-
- packaging.specifiers.SpecifierSet.contains
- packaging.version.Version
- Environment
- python
- Created
- 2026-08-17T18:59:12Z
Contract
- SpecifierSet('>=2.0').contains('2.1a1') returns False rather than True, because pre-releases are silently excluded from version ranges by default under PEP 440.
- assert Version('2.1a1') > Version('2.0')
- assert not SpecifierSet('>=2.0').contains('2.1a1')
- assert SpecifierSet('>=2.0').contains('2.1a1', prereleases=True)
Files
- NOTES.md
- contract.py
- csx.json
- requirements.txt