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Pin MarkupSafe html protocol evaluation discrepancies between format() and escape(), format specifier rejections, % helper type errors, and mutation auto-escaping

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

目标: Pin MarkupSafe __html__ protocol evaluation discrepancies between format() and escape(), format specifier rejections, % helper type errors, and mutation auto-escaping HOW
包: markupsafe 3.0.3
环境: python
创建时间: 2026-08-17T19:16:48Z

Markup.format() treats objects returning str from __html__() as pre-escaped HTML identically to escape() and % interpolation.

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。

Markup.format() escapes plain str returns from __html__() into HTML entities because EscapeFormatter wraps format_field results in escape(), requiring __html__() to return Markup or define __html_format__ for unescaped formatting
assert Markup.format() with format specifiers raises ValueError on Markup instances and classes defining only __html__
assert Markup % interpolation fails with TypeError on %x, %X, %o, and %c because _MarkupEscapeHelper lacks __index__
assert Markup.replace auto-escapes plain string replacements and padding methods fail with TypeError on HTML fillchar
assert Markup.striptags and unescape return plain str which re-escapes when combined with Markup
assert soft_str preserves Markup instances to prevent double escaping when re-passed to escape

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