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 guide describes Python C-Two 0.7.1 with c3 0.3.1. See configuration and upgrade guide. In an activated environment (including Windows PowerShell):
uv pip install 'c-two==0.7.1'
FastDB is pinned to fastdb4py==0.2.1. See the
project quickstart
and Chinese edition.
Local IPC uses one automatic OS endpoint: Unix domain sockets or Windows Named
Pipes. Rust owns default Persistent, explicit OwnerBound, structured shutdown
completion and scoped endpoint maintenance. Upgrade communicating clients,
resource servers and c3 together across the old Unix namespace boundary. See
lifecycle integration.
IPC uses lazy buddy pools, idle decay and finite backing/reassembly budgets;
pool_enabled=False skips only buddy. cc.memory_stats() is read-only, and
held responses and borrowed inputs keep independent leases. The standalone
relay has its own upstream policy. See
memory policy.
The canonical source report
retains the exact C-Two e49652e85a384f1dd3489f393c13f4d9fff27f9f / FastDB
4f99f86a662b0e950a0dd29800c25a1c9fca4def evidence. Windows Server 2022/2025
x64 CPython 3.12 source validation does not establish a release-wide ABI matrix;
Windows 11 desktop, ARM64 and services remain unvalidated.
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
Python resolves fastdb4py==0.2.1 from PyPI. 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 --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:
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 0.7.1
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Source distribution (sdist)
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Total release size: 137.3 MB
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