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 source branch prepares Python 0.6.0 and c3 0.2.0; neither candidate has been published yet. FastDB 0.2.1 is published and is the exact package dependency. See the project introduction and quickstart and its Chinese edition.
Local IPC uses Unix domain sockets or Windows Named Pipes. The earlier Windows source pair passed Windows Server 2022/2025 x64 tests; the updated release candidate still requires its own CI results. Windows 11 desktop, ARM64, and Windows services are not covered by that evidence.
Development
Run development commands from the repository root.
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
Python resolves fastdb4py==0.2.1 from PyPI. The Python native extension and
c3 use the official FastDB 0.2.1 source revision 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:
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 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 --timeout=30
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:
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
Release files for c-two 0.6.0
For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.
Source distribution (sdist)
| File | Size | Uploaded | |
|---|---|---|---|
| c_two-0.6.0.tar.gz | 538.3 kB | Details |
Built distributions (wheels)
Total release size: 118.2 MB
Release files / c_two-0.6.0.tar.gz
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| Tags | Source |
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