Stdlib Compatibility

Practical stdlib compatibility status and probe scope definitions for PYRS.

PYRS tracks stdlib compatibility with multiple probe scopes. Those scopes have different goals and should not be interpreted as equivalent claims.

Current Snapshot (2026-02-26)

Scope	Status
Top common-usecase checklist	`26/26` import and common smoke green.
Extended common-usecase matrix	`50/50` import and common smoke green.
Full stdlib inventory (host-supported modules)	`278/288` imports passing in latest full probe snapshot.
Mapped CPython test modules (full probe eligible set)	`PASS=33`, `FAIL=166`, `TIMEOUT=23`.

How To Read These Numbers

Probe	Meaning
Top / Extended common-usecase probes	Practical app-focused smoke viability for selected module sets.
Full stdlib probe	Comprehensive CPython 3.14 module inventory and mapped test-lane baseline.
Strict parity closure	Tracked separately in production-readiness and stub-accounting gates.

Run Probes Locally

Shell

  $ python3 scripts/probe_stdlib_extended.py --pyrs target/debug/pyrs --cpython-lib .local/Python-3.14.3/Lib --out perf/stdlib_compat_extended_latest.json --timeout 45  $ python3 scripts/probe_stdlib_full.py --pyrs target/debug/pyrs --cpython-bin /Library/Frameworks/Python.framework/Versions/3.14/bin/python3 --cpython-lib .local/Python-3.14.3/Lib --out perf/stdlib_full_probe_latest.json --import-timeout 20 --test-timeout 120 --jobs 0

Canonical Internal Trackers

docs/STDLIB_COMMON_USECASE_CHECKLIST.md
docs/STDLIB_EXTENDED_COMMON_USECASE_CHECKLIST.md
docs/STDLIB_FULL_BASELINE.md
docs/PRODUCTION_READINESS.md
docs/STUB_ACCOUNTING.md