Pylon
Async PostgreSQL mapper for the JALDIS platform. Provides a schema definition DSL, an PyQL query language, OpenSearch integration, and vector index support.
Requirements
- Python 3.13+
- PostgreSQL 18+
Installation
pip install pylon-db
For the native Rust client — PyQL queries from Rust, no Python interpreter
involved — add the pylon-db-client crate instead:
[dependencies]
pylon-db-client = "0.6"
It is published as pylon-db-client and imported as pylon_client; see the
Rust client reference.
Configuration
Pylon is configured programmatically via Config and its child dataclasses.
import os
from pylon import Client, Config, DatabaseConfig, SearchConfig, ModelConfig
client = Client(
config=Config(
database=DatabaseConfig(
host="localhost",
port=5432,
name="mydb",
user="myuser",
password=os.environ["PYLON_DB_PASSWORD"],
),
search=SearchConfig(
host="localhost",
port=9200,
password=os.environ["PYLON_SEARCH_PASSWORD"],
),
models=ModelConfig(
api_style="openai",
api_url="https://api.openai.com",
model="text-embedding-3-small",
secret=os.environ["OPENAI_API_KEY"],
),
)
)
A pylon.toml file can be used instead via load_config():
from pylon import Client
from pylon.config import load_config
client = Client(config=load_config())
See the configuration reference for the full pylon.toml schema.
Development
Pylon is a Rust workspace plus a Python package; the two are joined by a
PyO3 extension module (pylon._core) built with maturin.
Building
maturin develop # builds pylon._core into the active virtualenv
pip install -e ./ # maturin develop alone can leave a stale .so behind
The test suite fails fast with a "rebuild it" message if pylon._core is
older than the Python code being tested against it, rather than silently
skipping the affected tests.
Testing
python -m pytest # Python suite (live-DB tests excluded)
cargo test --workspace --exclude pylon-py # Rust suite
--exclude pylon-py is required, and is not the same caveat as excluding it
from linting. PyO3 extension modules link against the interpreter through
build configuration that only maturin supplies, so a plain cargo build or
cargo test on that crate fails at the link step with undefined symbols
(_PyList_New, _Py_NoneStruct, …). It still type-checks fine, which is
why CI runs cargo clippy -p pylon-py --lib separately — that crate is the
only consumer of several pylon-core/pylon-pgcon APIs, so skipping it
entirely would let a signature change break the extension unnoticed.
Live-Postgres tests are opt-in and need a throwaway database:
export PYLON_PGCON_TEST_DSN=postgresql://postgres:postgres@localhost:5432/pylon_live_test
cargo test --workspace --exclude pylon-py -- --ignored --test-threads=1
python -m pytest -m live_db
These create and drop schemas freely — never point them at a real database.
Linting
cargo clippy --workspace --exclude pylon-py --all-targets -- -D warnings
cargo clippy -p pylon-py --lib -- -D warnings
cargo fmt --check
ruff check pylon tests
ruff format --check pylon tests
1 maintainer
Metadata
1 maintainer
Release files for pylon-db 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 | |
|---|---|---|---|
| pylon_db-0.6.0.tar.gz | 1.1 MB | Details |
Built distributions (wheels)
Total release size: 76.6 MB
Release files / pylon_db-0.6.0.tar.gz
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| Size | 1.1 MB |
| Tags | Source |
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