lancedb-gatefixer[bot]
16e1967efc
## Summary - align the PyO3 runtime and build ABI floor with the declared Python 3.10 minimum - add a regression test that keeps both ABI features synchronized with `requires-python` ## Root cause The Python 3.10 support-floor update originally changed PyO3 to `abi3-py310`, but a later dependency update reverted both PyO3 features to `abi3-py39`. Published Windows wheels were consequently tagged `cp39-abi3` while importing `PyCMethod_New`, a stable-ABI procedure absent from CPython 3.9.0 and 3.9.1. Windows reports that mismatch as “The specified procedure could not be found” while loading `_lancedb`. Restoring `abi3-py310` makes the wheel tag and native imports agree with the package metadata and prevents future wheels from advertising unsupported Python 3.9 compatibility. ## Validation - `uv run --extra tests pytest python/tests/test_package_metadata.py -q` - `uv run --extra tests --extra dev ruff format --check .` - `uv run --extra tests --extra dev ruff check .` - `cargo fmt --all` - `cargo check --quiet -p lancedb-python` - `uvx --from maturin==1.12.4 maturin build --profile ci` (built `lancedb-0.37.1b0-cp310-abi3-manylinux_2_34_x86_64.whl`) Fixes #2051 <!-- lance-gatekeeper-fix:v1 agent=d66c984498190d2207d1c5126cba5047 generation=1 --> --------- Co-authored-by: Gatefixer <313497061+lancedb-gatefixer[bot]@users.noreply.github.com>
LanceDB Python SDK
A Python library for LanceDB.
Installation
pip install lancedb
Pre-Haswell x86_64 hosts: lancedb-compat
The default lancedb wheel targets x86-64-haswell (AVX2 + FMA + F16C) for full performance on modern hardware. Pre-Haswell hosts — Intel Sandy Bridge / Ivy Bridge / Westmere; AMD Bulldozer / Piledriver / Steamroller — don't have AVX2 and crash with Illegal instruction at import lancedb.
For those hosts, install the lancedb-compat package instead:
pip install lancedb-compat
Same Python API (import lancedb works as usual). The compat wheel is compiled at the x86-64-v2 baseline (Nehalem-class) and uses runtime SIMD dispatch in the embedded lance crate to pick the right kernel tier (scalar / AVX / AVX+FMA / AVX2+FMA / AVX-512) at load time, so it still goes fast on modern hardware while running cleanly on the pre-Haswell silicon. Use lance.simd_info() from Python to verify which tier was selected.
lancedb and lancedb-compat install to the same lancedb/ namespace and conflict at install time. Pick one. To switch, pip uninstall lancedb first, then pip install lancedb-compat (or vice-versa).
If you need a custom baseline (or lancedb-compat isn't yet published for your platform), build from source with the override:
RUSTFLAGS="-C target-cpu=x86-64-v2" maturin build --release
pip install ./target/wheels/lancedb-*.whl
Preview Releases
Stable releases are created about every 2 weeks. For the latest features and bug fixes, you can install the preview release. These releases receive the same level of testing as stable releases, but are not guaranteed to be available for more than 6 months after they are released. Once your application is stable, we recommend switching to stable releases.
pip install --pre --extra-index-url https://pypi.fury.io/lancedb/ lancedb
Usage
Basic Example
import lancedb
db = lancedb.connect('<PATH_TO_LANCEDB_DATASET>')
table = db.open_table('my_table')
results = table.search([0.1, 0.3]).limit(20).to_list()
print(results)
Development
See CONTRIBUTING.md for information on how to contribute to LanceDB.