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* feat: Python 3.12+/3.13 compat + sub-interpreter wrapper
Hanzo fork of go-python/cpy3. See HANZO_CHANGES.md for full diff.
- Polyfill APIs removed in 3.12 (per-type ClearFreeList helpers) and
3.13 (PyEval_InitThreads, Py_SetPath/PythonHome/ProgramName,
PySys_SetArgv/AddWarnOption/AddXOption/SetPath,
Py_SetStandardStreamEncoding, PyEval_ThreadsInitialized) so existing
call sites compile against modern CPython. Polyfills route to the
PyConfig API where there's a meaningful replacement, return 0/no-op
otherwise.
- New PEP 684 SubInterpreter wrapper (subinterp.go) — recommended
primitive for tenant/per-worker isolation on 3.12+. Defaults follow
PEP 684 (own GIL, threads on, no daemon threads, refuse non-isolated
C extensions). Falls back to Py_NewInterpreter on 3.11 and older.
- Free-threading awareness (PEP 703) — IsGILDisabled() reports at
runtime whether the linked CPython was built with --disable-gil.
- pkg-config switched from "python3" to "python3-embed" so libpython
links cleanly on Linux distros that split the embed flags.
- Module path: github.com/go-python/cpy3 -> github.com/hanzoai/cpy3.
Go 1.21+. Package name (python3) unchanged.
- CI matrix: Python {3.11, 3.12, 3.13} x Go {1.21, 1.22} on Ubuntu.
License remains MIT. Original go-python team credited in HANZO_CHANGES.md
and every modified file's header.
* feat: JSON hot-path helper + 3.13t build script
- LoadSource + CallJSONFunctionByName: single-cgo-crossing helpers
for the common "JSON-in, JSON-out" extension embedding contract.
Roughly 2x faster than the long form via individual wrappers and
stack-safer under sustained load (macOS SIGBUS at ~400k iters of
the 9-call long form is mitigated by collapsing to 1 cgo call).
- ErrUnknownFunction: sentinel error for missing/non-callable
lookups so callers can errors.Is.
- scripts/build-python313t.sh: idempotent local build of CPython
3.13.x with --disable-gil. Writes a python3-embed.pc so callers
steer via PKG_CONFIG_PATH.
- HANZO_CHANGES.md + README updated.
- .gitignore: exclude python313t-build/ python313t-src/.
* ci: split test runs by Python global state
TestSubInterpreter_* and TestCallJSONFunctionByName_* / TestLoadSource_*
share global Py state with the data-type/error tests. Running them
in the same `go test` invocation can hang on darwin after the
data-type tests have already touched the main interpreter. Split
into two test steps so each starts from a fresh process.
* test: move json_hotpath tests in-package + share Py init
Move from package python3_test to package python3 so they share
Py_Initialize() state with subinterp_test.go. Each test pins its
own OS thread, calls Py_Initialize (idempotent), creates a fresh
sub-interp, and unpins on return. No PyEval_SaveThread in teardown
— the sub-interp's Close already released the calling thread's GIL.
This eliminates a SIGSEGV-on-second-test pattern caused by trying
to PyEval_SaveThread a state that's already been saved.
* docs: README example for the JSON hot path
Show LoadSource + CallJSONFunctionByName end-to-end with luxfi/log
for context. The helpers themselves take no logger dependency.
cpy3 scripts
build-python313t.sh
Builds a local CPython 3.13.x with --disable-gil (PEP 703 free-
threading). Output lives at ./python313t-build/ relative to the repo
root. Idempotent — re-running is a no-op if the binary is present and
correctly reports sys._is_gil_enabled() == False.
Prereqs
macOS:
xcode-select --install
Debian/Ubuntu:
sudo apt-get install -y build-essential libssl-dev libffi-dev \
zlib1g-dev libbz2-dev liblzma-dev libsqlite3-dev libreadline-dev
Run
./scripts/build-python313t.sh
Override patch version (defaults to 3.13.5):
PYTHON_VERSION=3.13.7 ./scripts/build-python313t.sh
Use the built Python with cpy3
cpy3 links against python3-embed via pkg-config. The build script
writes a python3-embed.pc pointing at the new install so callers just
need to prepend its directory:
export PKG_CONFIG_PATH="$PWD/python313t-build/lib/pkgconfig:${PKG_CONFIG_PATH:-}"
# macOS:
export DYLD_LIBRARY_PATH="$PWD/python313t-build/lib:${DYLD_LIBRARY_PATH:-}"
# Linux:
export LD_LIBRARY_PATH="$PWD/python313t-build/lib:${LD_LIBRARY_PATH:-}"
go test ./...
cpy3.IsGILDisabled() will now return true.
Time budget
Clean build: 10-20 minutes on a 2024-era laptop with -j$(nproc).
Incremental rebuilds (rare — the tarball doesn't change) are minutes.