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August 2026

4 participants
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[ANN] pyrift — static analyser with 7 PyPy-specific detection rules
by Bhuvansh Kataria Aug. 24, 2026

Aug. 24, 2026

Hello, I have released pyrift, which includes 7 PyPy-specific rules that detect code behaving silently differently on PyPy vs CPython: PPY001 - __del__ resource cleanup silently leaks due to GC timing PPY002 - ctypes incomplete implementation PPY003 - sys.getrefcount() always returns a dummy constant PPY004 - weakref.proxy() raises ReferenceError unpredictably PPY005 - file writes may be lost without explicit flush PPY006 - monkey-patching built-in types behaves differently PPY007 - sys.intern() identity guarantees not preserved pip install pyrift && pyrift scan . GitHub: https://github.com/BHUVANSH855/pyrift PyPI: https://pypi.org/project/pyrift/ Rule docs: https://github.com/BHUVANSH855/pyrift/blob/main/docs/rules.md I maintain the pypy-review-toolkit at: https://github.com/BHUVANSH855/pypy-review-toolkit I would value feedback from the PyPy team on rule correctness and any behaviour differences I have missed that would make good additions. Bhuvansh Kataria

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RFC: experimenting with using claude to drive the rpython python3 port and python parity
by Ronny Pfannschmidt Aug. 20, 2026

Aug. 20, 2026

Hi everyone, as i currently have access to claude max, i'm taking the opportunity to try and do something positive, human communicated/driven for projects i love i started playing around with this on https://github.com/RonnyPfannschmidt/pypy/pull/1 where i steer claude to get rpython to import on python 3 without actually fixing anything about actually running on python3 my rough plan for this experiment is to 1. import clean, world is broken 2. run the testrunner on python3.x without setting everything on fire 3. run some simple tests on python3, passes all tests on python2 4. try to reach rpython on python3.6 ops 5. try to reach rpython on python3.11 ops however i also want to ensure this experiment is something that can land so the opinions of the pypy core developers on the approach and llm usage in general would be helpful -- Ronny

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