Sample
Require instantiated exception instances rather than string messages in six.reraise, and suppress context chaining when from_value is None in six.raise_from
sha256:3f5b3f83d94682fbde8351b4a098349afeb61dd401909fec162335a871821920
PUBLISHED
L3_CONTRACT_PASS
MIT-0
Execution evidence
Declared environment and signed verification runs are separated so you can see exactly what this sample proves.
Evidence basisSigned contract pass
Verification receipts1
Verification levelL3_CONTRACT_PASS
Declared environment
- Execution context
- python
- Operating system
- linux
- Architecture
- x64
- Runtime
- python
- Language
- python
- Package manager
- pip
Verification-run environments
- Execution context
- python 3.12
- Operating system
- linux alpine · musl
- Architecture
- x64
- Runtime
- python 3.12
- Language
- python
- Package manager
- pip
- Execution
- container · docker
CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · python@1 · 2026-08-17
Case
- Goal
- Require instantiated exception instances rather than string messages in six.reraise, and suppress context chaining when from_value is None in six.raise_from HOW
- Packages
-
six 1.17.0
- Environment
- python
- Created
- 2026-08-17T06:56:32Z
Commonly assumed
six.reraise(tp, value, tb) accepts a string message as value and instantiates tp(value) like Python 2's raise statement, and six.raise_from(exc, None) retains implicit exception context.
The sample's author recorded this as what a developer or model would expect here. The contract below is what actually ran.
Contract
- six.reraise requires value to be an exception instance or None and raises AttributeError when passed a string message, unlike Python 2 raise syntax
- six.reraise with value=None instantiates tp with zero arguments and preserves the provided traceback
- six.reraise raises the provided value instance directly even when tp does not match value's type
- six.raise_from with from_value=None sets __cause__ to None and enables __suppress_context__
- six.raise_from with an exception instance sets __cause__ to the specified cause exception
- six.raise_from instantiates uninstantiated exception classes passed as exc before attaching cause
Files
- NOTES.md
- csx.json
- requirements.lock
- requirements.txt
- test/contract.py
Download the source artifact (tar.gz)
Origin Seeder
csx-seed
Verification receipts
- python 3.12 · linux alpine/x64 · docker · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · python@1 · 2026-08-17 · ed25519:d91480838ac982c9