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Title: gh-116946: add `Py_TPFLAGS_IMMUTABLETYPE` to several internal types by picnixz · Pull Request #138582 · python/cpython · GitHub

Open Graph Title: gh-116946: add `Py_TPFLAGS_IMMUTABLETYPE` to several internal types by picnixz · Pull Request #138582 · python/cpython

X Title: gh-116946: add `Py_TPFLAGS_IMMUTABLETYPE` to several internal types by picnixz · Pull Request #138582 · python/cpython

Description: This only adds the Py_TPFLAGS_IMMUTABLETYPE flag and assumes that other GC-related issues are solved (not all types are actually empty). I've added NEWS entries just because we also mention transforming extension modules from single-phase to multi-phase. It doesn't hurt mentioning this if a type can be observed with obj = public_func(); print(type(obj)). @serhiy-storchaka Can I split the PR for immutable types into those that are in _test*api and xxlimited* with those that are used in release builds? There is just one type _interpreters.CrossInterpreterBufferView that I'm unsure of. @pablogsal Am I correct to assume that _remote_debugging.RemoteUnwinder should be immutable and is really internal? It's only "publicly" accessible through profiling.sampling.SampleProfiler.unwinder but I don't know if it's meant to be used externally. Issue: gh-116946

Open Graph Description: This only adds the Py_TPFLAGS_IMMUTABLETYPE flag and assumes that other GC-related issues are solved (not all types are actually empty). I've added NEWS entries just because we also mention tra...

X Description: This only adds the Py_TPFLAGS_IMMUTABLETYPE flag and assumes that other GC-related issues are solved (not all types are actually empty). I've added NEWS entries just because we also mention...

Opengraph URL: https://github.com/python/cpython/pull/138582

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53c9fe8 make `_tkinter.Tcl_Obj` immutable picnixz Sep 6, 2025 https://github.com/python/cpython/pull/138582/commits/53c9fe80cceeb997767c2eab2f5f11eda6f502ee
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2ceb790 make `zlib.Compress` immutable picnixz Sep 6, 2025 https://github.com/python/cpython/pull/138582/commits/2ceb790da6d6c32482b8ed67ea6b3231bfc35715
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ba55263 make `[posix,nt].ScandirIterator` immutable picnixz Sep 6, 2025 https://github.com/python/cpython/pull/138582/commits/ba552636c4bcba0ae0e5b7d3f3bd3376ee156219
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