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pyperf

Python performance notes and pyperf-lint (not the PyPI microbenchmark harness).

Part of XPerf. Corpus-ready (G3 2026-10-22). Defaults: pp-str-plus-hot/pp-print-hot off, pp-list-plus-rebind hint. One rule removed (tombstone, never got a slug).

Contents

Focus

Prefer ''.join(...) over s += and append over xs = xs + [...] in hot loops; keep print out of tight loops.

Run lint

export PYTHONPATH=packages/pyperf/pyperf-lint
python3 -m pyperf_lint path/to/sources
bash packages/pyperf/scripts/smoke-lint.sh
bash packages/pyperf/scripts/self-lint.sh

Layout

docs/guide-src/   chapter sources
docs/             assembled guide + corpus.md + evidence-policy.md
evidence/         pp-str-plus-hot, pp-list-plus-rebind, pp-print-hot measured (not escalated); PP004 tombstone
examples/         tiny demos + evidence bench
pyperf-lint/      checker (pyperf_lint package) + fixtures
scripts/          smoke-lint.sh, self-lint.sh

Contributing

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Python performance guide (v0)

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ContentsFocusRun lintLayout