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Currently pip install libcst will do a from-source build on free-threaded 3.13.0:
goldbaum at Nathans-MBP in ~/Documents/cryptography on main!
± pip install libcst
Collecting libcst
Downloading libcst-1.5.0.tar.gz (772 kB)
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 773.0/773.0 kB 22.9 MB/s eta 0:00:00
Installing build dependencies ... done
Getting requirements to build wheel ... done
Preparing metadata (pyproject.toml) ... done
Collecting pyyaml>=5.2 (from libcst)
Using cached PyYAML-6.0.2-cp313-cp313t-macosx_14_0_arm64.whl
Building wheels for collected packages: libcst
Building wheel for libcst (pyproject.toml) ... done
Created wheel for libcst: filename=libcst-1.5.0-cp313-cp313t-macosx_14_0_arm64.whl size=2027094 sha256=ec7f1a08268640717734e28b8454ca23043112fb2f002b46694494c82cf6b6bf
Stored in directory: /Users/goldbaum/Library/Caches/pip/wheels/af/db/82/f05ed1829e60f978a9af19520c78cb52df1bed762e579d7f84
Successfully built libcst
Installing collected packages: pyyaml, libcst
Successfully installed libcst-1.5.0 pyyaml-6.0.2
[notice] A new release of pip is available: 24.2 -> 24.3.1
[notice] To update, run: pip install --upgrade pip
goldbaum at Nathans-MBP in ~/Documents/cryptography on main!
± python -VV
Python 3.13.0 experimental free-threading build (main, Nov 5 2024, 16:45:19) [Clang 16.0.0 (clang-1600.0.26.3)]
The build succeeds, but it probably shouldn't, and immediately segfaults if I try to import anything that imports the native module:
$ python
Python 3.13.0 experimental free-threading build (main, Nov 5 2024, 16:45:19) [Clang 16.0.0 (clang-1600.0.26.3)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import libcst.codegen.gen_matcher_classes as matcher_codegen
[1] 33127 segmentation fault python
I think the first step is likely going to be updating the PyO3 dependency to 0.23 once that comes out (hopefully this week). Since the crate is at PyO3 0.20 right now, updating to 0.21 and 0.22 first will likely help.