C-Two Python SDK
C-Two exposes stateful Python resources through typed CRM contracts over same-process calls, local IPC, or an external HTTP relay. This package projects the shared Rust runtime into Python.
Python C-Two 0.10.0 pairs with c3 0.6.0. See the release and migration notes.
Install the matching published versions:
uv pip install 'c-two==0.10.0'
# Only for FastDB Payload contracts:
uv pip install 'c-two[fastdb]==0.10.0'
The base package has no Python runtime dependencies. Ordinary CRM definition,
registration, direct/IPC/relay calls and errors do not load FastDB or NumPy.
The fastdb extra pins fastdb4py==0.2.4; using FastDB payloads without it
reports the extra to install. The exact pin selects the validated 0.x binding
instead of allowing an untested later native interface.
Local IPC uses Unix domain sockets or TokenUser-scoped Windows Named Pipes. Unix roots select the final endpoint directory, with short names and directory-relative connections. Rust owns Persistent/OwnerBound policies, structured shutdown and scoped maintenance. Install matching builds across communicating clients, resource servers and c3. See the lifecycle guide.
cc.connect(..., timeout=...) bounds connection acquisition across pool waiting, handshake and route discovery. cc.with_call_options(proxy, timeout=...) sets business-call waiting separately. Custom Unix endpoint directories can use 0755 when the current user owns them and other identities cannot modify them; Windows uses its SID-scoped pipe namespace. See connection deadlines and endpoint configuration.
cc.set_server(startup_timeout=30.0) sets the native startup wait before registration. Omitted/None retains the finite five-second default; zero expires immediately. Startup expiry is identified by CoreError.lifecycle_kind == 'startup_timeout', with startup_stage and timeout_seconds; bind I/O failures keep their OS fields without a configuration-error label. See server startup deadlines for freezing and cleanup semantics.
IPC uses lazy buddy pools, idle decay and finite backing/reassembly budgets; pool_enabled=False skips buddy. cc.memory_stats() observes native accounting; held responses and borrowed inputs retain independent leases. The standalone relay has its own upstream policy. See the memory guide.
Use cc.connection_events() for one cancellable, bounded stream of incoming and outgoing physical IPC events, tagged by side. ConnectionObservation.snapshot() retains late inspection; its old blocking wait_closed() is removed. Physical observations work without a pending call. OwnerBound hosts support explicit, single-use recovery tickets during the original grace period. Bind/connect failures preserve io_kind, raw_os_error and io_operation on public cc.error.CoreError. These features share the Rust implementation on macOS, Linux and Windows x64 and ARM64; see the lifecycle guide for API examples.
cc.server_credential() -> EndpointCredential | None reads the listener's lifecycle snapshot without inspection or a gate lock. CoreError.endpoint_unverified_reason reports unverifiable Unix binds; Unix credentials use schema 4 without device, and default endpoint directories carry namespace disk format 3. cc.Runtime() creates independent Python bindings and native sessions: configure and shut down an explicit instance through its methods, while cc.serve() handles signals only for the module-level default runtime. See the independent runtime example. IPC handshake 14 and namespace format 3 do not interoperate with 0.9.x, so upgrade SDKs, c3 and Node consumers together; the release notes cover snapshot semantics and custom-root migration.
Development
Use canonical main for source development and run commands from the repository root. Python patch-release provenance is recorded with its release notes; the c3 release's rc-manifest.json identifies that CLI release's source, which can differ from a later Python patch:
git clone https://github.com/world-in-progress/c-two.git
cd c-two
Prerequisites:
- Python 3.10 or newer
- Python 3.12 for standard local development
- Python 3.14.3t when testing free-threading support
- Rust 1.95 or newer
uv- for full interoperability tests: the FastDB
v0.2.4source checkout at../fastdb
The default workspace dev group selects c-two[fastdb] and resolves
fastdb4py==0.2.4 from PyPI. Bare package installation omits it. The Python native extension and
c3 pin FastDB source f82fa13adeae2b87a295bf984821c85c44b55a3d for their source-mode static
builds. Core and Rust SDK tests use the published Rust bindings with the matching
FastDB Core SDK
in system link mode. Golden specs and TypeScript interoperability fixtures still
need the sibling source checkout; it is not a Python package override.
Install dependencies and build the Python native extension. This also compiles the required Rust core crates; no separate Rust prebuild step is needed:
FASTDB_PAYLOAD_LINK_MODE=source uv sync
Rebuild the native extension after changing Rust code:
FASTDB_PAYLOAD_LINK_MODE=source uv sync --reinstall-package c-two
Relay-dependent tests and examples require the standalone c3 binary. From a
source checkout, build and link it before running relay flows:
FASTDB_PAYLOAD_LINK_MODE=source python tools/dev/c3_tool.py --build --link
The Python SDK does not embed or start a relay server. Start the standalone
Rust relay with c3 relay, Docker Compose, or orchestration such as
Kubernetes, then point Python code at its relay anchor with
C2_RELAY_ANCHOR_ADDRESS or cc.set_relay_anchor(). The anchor is used for
registration and name resolution. Remote HTTP calls still use the resolved
route's relay_url directly, and local direct IPC is selected only for a
loopback/local anchor.
Relay-aware clients preflight routes before the first call and re-resolve
structured stale-route responses; set C2_RELAY_ROUTE_MAX_ATTEMPTS to tune the
maximum route acquisition attempts (default 3, valid range 1..=32, 0 is
treated as 1). Ambiguous data-plane failures are not replayed.
After the source-mode build, configure the absolute Core SDK library directory for Rust consumers spawned by interoperability tests. Follow the development setup in the repository README and Windows guide for platform-specific loader paths and test prerequisites. Keep the existing extension build while running the Python tests:
C2_RELAY_ANCHOR_ADDRESS= uv run --no-sync pytest sdk/python/tests -q -n 4 --timeout=30
The four-worker command is for Linux/macOS; omit -n 4 on Windows. See the test guide for prerequisites and longer real-idle and interoperability cases.
Run Rust core checks when validating shared native runtime changes:
cargo test --manifest-path core/Cargo.toml --workspace
For CLI build, link, and test commands, see the CLI guide.
Examples
Python examples live under ../../examples/python/:
uv sync --group examples
uv run python examples/python/local.py
Relay examples also need a running standalone relay, for example:
FASTDB_PAYLOAD_LINK_MODE=source python tools/dev/c3_tool.py --build --link
c3 relay --bind 127.0.0.1:8080
Benchmarks
Python-specific benchmarks live in benchmarks/:
C2_RELAY_ANCHOR_ADDRESS= uv run python sdk/python/benchmarks/segment_size_benchmark.py
1 maintainer
Metadata
1 maintainer
Release files for c-two 0.10.0
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Signed by GitHub Actions, verified by PyPI on Oct 30, 2026.
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