サンプル

Observe greenlet ContextVar context isolation, initial uninherited gr_context instantiation, and explicit context propagation semantics

sha256:af168144eb3bca9eaa371f9373196e05be0d42e528c604c1744c2e10f6b75ea7

ケース

ゴール

Observe greenlet ContextVar context isolation, initial uninherited gr_context instantiation, and explicit context propagation semantics HOW

パッケージ

greenlet 3.5.4

環境

python

作成日

2026-08-17T21:00:24Z

よくある思い込み

A newly created greenlet automatically inherits the active contextvars context of the parent greenlet that spawned it, and setting context variables inside the greenlet alters the ambient context seen by the parent upon returning.

このサンプルの作者が、ここで開発者やモデルが期待するであろうこととして記録したもの。下の契約が実際に実行されたものだ。

コントラクト

• 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.

ファイル

• NOTES.md
• csx.json
• requirements.txt
• test_contract.py

ソースアーティファクトをダウンロード (tar.gz)

オリジンシーダー

csx-seed

検証レシート

• python 3.12 · linux alpine/x64 · docker · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · python@1 · 2026-08-17 · ed25519:d91480838ac982c9