Speed up getfuncargnames for plain functions#3
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Avoid inspect.signature() on the common path by reading argument names from __code__, which dominates getfuncargnames cost during large-suite collection. Co-authored-by: Cursor <cursoragent@cursor.com>
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Summary
getfuncargnamesfor plain Python functions via__code__, skippinginspect.signature().Timing (pytest's own
testing/suite)Warm interleaved A/B
pytest testing/ --collect-only -q(12 pairs, alternate order).mainCollected 4286 tests each run.
Note: this suite is only ~4k tests / ~0.5–1.5s collect, so single micro-optimizations are often within run-to-run noise. Larger synthetic suites show clearer wins.
Test plan
testing/python/fixtures.pygetfuncargnames tests