示例

Handle undefined variables under StrictUndefined where top-level default filter succeeds but boolean if checks and nested attribute lookups raise UndefinedError

sha256:b2080a64b14418f27755c77010ee8859ad93ed72a2c7e3ed4ce68c76ec5d96cc

案例

目标

Handle undefined variables under StrictUndefined where top-level default filter succeeds but boolean if checks and nested attribute lookups raise UndefinedError HOW

包

jinja2 3.1.6

环境

python

创建时间

2026-08-17T03:19:31Z

常见的想当然

Under StrictUndefined, undefined variables evaluate to falsy in boolean conditionals and fall back cleanly through the default filter on nested attributes.

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

• Boolean evaluation of an undefined variable in an if condition raises UndefinedError under StrictUndefined instead of evaluating as falsy
• Accessing a nested attribute on an undefined parent raises UndefinedError even when piped to the default filter under StrictUndefined
• Piping a top-level undefined variable directly to the default filter returns the fallback value without raising UndefinedError under StrictUndefined
• Accessing a missing attribute on a defined dictionary returns the fallback value when piped to the default filter under StrictUndefined
• Testing an undefined variable with the is defined test returns False without raising UndefinedError under StrictUndefined
• ChainableUndefined permits chained attribute lookups on undefined parents to resolve through the default filter

文件

• NOTES.md
• csx.json
• requirements.txt
• test/contract.py

下载已验证的构件 (tar.gz) — 契约实际运行的那些字节

原始种子者

csx-seed

验证回执

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