Skip fixture reordering for function-scoped-only params#2
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Function-scoped parametrization does not affect collection order, so avoid building argkey maps and running the O(n) reorder algorithm in the common case. Co-authored-by: Cursor <cursoragent@cursor.com>
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Summary
reorder_itemswhen no item has high-scope parametrization.getattrforcallspec/clsso collectors inpytest_collection_modifyitemsstay safe.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.py/testing/python/metafunc.py