Sample
greenlet 3.5.4: Observe greenlet ContextVar context isolation, initial uninherited gr_context instantiation, and explicit context propagation semantics
Verified sample for pypi greenlet 3.5.4: Observe greenlet ContextVar context isolation, initial uninherited gr_context instantiation, and explicit context…
sha256:af168144eb3bca9eaa371f9373196e05be0d42e528c604c1744c2e10f6b75ea7
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
- Observe greenlet ContextVar context isolation, initial uninherited gr_context instantiation, and explicit context propagation semantics
- Packages
- Symbols
-
- greenlet.greenlet.gr_context
- greenlet.greenlet
- Environment
- python
- Created
- 2026-08-17T21:00:24Z
Contract
- A newly created greenlet starts with gr_context as None and executes within a fresh isolated contextvars Context that does not inherit the caller greenlet's ContextVar values, unless a Context is explicitly assigned to gr_context prior to switching.
- Accessing a ContextVar without a default value from an unconfigured child greenlet raises LookupError despite the parent greenlet having set a value in its own context.
- Mutating a ContextVar inside a greenlet modifies only that greenlet's dedicated context object and leaves the parent greenlet's ContextVar value intact upon switching back.
- Assigning a copied contextvars.Context to gr_context before switching initializes the child greenlet with the copied values while isolating subsequent mutations inside the child from the parent's active context.
- Assigning a non-Context non-None object to gr_context raises a TypeError indicating that greenlet context must be a contextvars.Context or None.
Files
- NOTES.md
- csx.json
- requirements.txt
- test_contract.py