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.
This branch prepares Python C-Two 0.7.5 and companion c3 0.3.4; neither is published by this change. See the release preparation notes.
After publication:
uv pip install 'c-two==0.7.5'
# Only for FastDB Payload contracts:
uv pip install 'c-two[fastdb]==0.7.5'
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==0.2.2; 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 current-logon-SID 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.
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.
The historical 0.7.4 publication record identifies published sources, Linux/macOS and Windows Server 2022/2025 x64 gates, and verification of public artifacts. Windows 11 desktop, Windows ARM64 and Windows services are outside this validation.
Development
Use canonical main for source development and run commands from the repository root. The matching c3 release's rc-manifest.json identifies release source:
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 toolchain
uv- for full interoperability tests: the FastDB
v0.2.1source checkout at../fastdb
The default workspace dev group selects c-two[fastdb] and resolves
fastdb4py==0.2.2 from PyPI. Bare package installation omits it. The Python native extension and
c3 pin FastDB source 4f99f86a662b0e950a0dd29800c25a1c9fca4def 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 0.7.5
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Source distribution (sdist)
| File | Size | Uploaded | |
|---|---|---|---|
| c_two-0.7.5.tar.gz | 1.1 MB | Details |
Built distributions (wheels)
Total release size: 139.6 MB
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