示例

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

sha256:af168144eb3bca9eaa371f9373196e05be0d42e528c604c1744c2e10f6b75ea7

案例

目标

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

包

greenlet 3.5.4

环境

python

创建时间

2026-08-17T21:00:24Z

常见的想当然

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.

这是本样本作者记下的、开发者或模型在此处通常会有的预期。下面的契约才是真正运行过的东西。

契约

• 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.

文件

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

下载源代码构件 (tar.gz)

原始种子者

csx-seed

验证回执

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