pyperf Python performance guide (v0)pyperf rule ids (slugs)pyperf corpus targets pyperf evidence policy

pp-deepcopy-hot — measured, still hint pp-json-hot — measured, still hint pp-list-plus-rebind — xs = xs + [i] vs append pp-open-hot — measured, still hint pp-print-hot — print in loop vs join once (stdout discarded)pp-str-plus-hot — str += vs str.join

pp-datetime-format-in-loop pp-datetime-format-in-loop — removed 2026-10-23 (Asia/Shanghai)pp-deepcopy-in-loop — renamed 2026-10-27 (Asia/Shanghai)pp-json-in-loop — renamed 2026-10-27 (Asia/Shanghai)pp-open-in-loop — renamed 2026-10-27 (Asia/Shanghai)pp-print-in-loop — renamed 2026-10-27 (Asia/Shanghai)pp-regex-compile-in-loop — removed pp-regex-compile-in-loop — removed 2026-10-23 (Asia/Shanghai)pp-str-plus-in-loop — renamed 2026-10-27 (Asia/Shanghai)PP004 — removed PP004 — removed 2026-10-22 (Asia/Shanghai)

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Contributing Changelog Security Policy Contributor Covenant Code of Conduct AGENT.md — XPerf agent operating contract

LanguagesPythonEvidence_removed

PP004 — removed 2026-10-22 (Asia/Shanghai)

Status: removed. Jitter-controlled retest showed reverse/null speed claim. A 2026-10-23 rerun on CPython 3.15.1 is about 1.38× (27.422 ms vs 19.822 ms, 20000 calls) and stays removed.

No semantic slug was assigned; do not reuse PP004 or invent a replacement id with the same number.
Matcher deleted; historical JSONL (if any) kept beside this note.

PP004 — removed

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