[pull] main from python:main#843
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pull[bot] merged 20 commits intotj-python:mainfrom Mar 10, 2026
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Co-Authored-By: Thomas Kowalski <thom.kowa@gmail.com>
Co-authored-by: Stan Ulbrych <89152624+StanFromIreland@users.noreply.github.com>
…ion API (#144599) Add a warning in the free-threading extensions howto explaining that PyObject.ob_mutex is reserved for the critical section API and must not be locked directly with PyMutex_Lock, as this can cause deadlocks. Extension authors who need their own lock should add a separate PyMutex field to their object struct. Also add an ob_mutex member entry under PyObject in the C API reference (Doc/c-api/structures.rst) with a cross-reference to the howto. Co-authored-by: Victor Stinner <vstinner@python.org>
…alid format (GH-145744) Only set the format attribute after successful (re-)initialization.
Co-authored-by: Kumar Aditya <kumaraditya@python.org>
…mortal objects (#145045)
Previously, component-wise relative error bound was tested. However, such bound can't exist already for complex multiplication as one can be used to perform subtraction of floating-point numbers, e.g. x and y for z0=1+1j and z1=x+yj. ```pycon >>> x, y = 1e-9+1j, 1+1j >>> a = x*y*y.conjugate()/2;a (1.0000000272292198e-09+1j) >>> b = x*(y*y.conjugate()/2);b (1e-09+1j) >>> b == x True >>> (a.real-b.real)/math.ulp(b.real) 131672427.0 ```
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