lancedb-gatefixer[bot]
27dd92c67e
## Summary - expand the synchronous debugger regression to enumerate every exposed connection attribute while the Python background loop is unavailable - retain direct representation checks for connections and tables ## Root cause VS Code debugpy suspends Python threads at a breakpoint and inspects local variables. Connection representation and property access previously dispatched asynchronous work to LanceDBBackgroundEventLoop and waited for the suspended loop thread, deadlocking the debugger. The production safeguards landed in #3620 and #3788; this regression exercises debugger-style whole-object expansion so a newly exposed property cannot reintroduce the original failure. ## Validation - uv run --no-sync pytest python/tests/test_db.py::test_sync_debugger_inspection_does_not_use_background_loop python/tests/test_db.py::test_read_consistency_interval_does_not_use_background_loop -q (2 passed) - uv run --no-sync pytest python/tests/test_db.py -q (48 passed) - python/.venv/bin/ruff format --check python/python/tests/test_db.py - python/.venv/bin/ruff check . - git diff --check Fixes #3611 <!-- lance-gatekeeper-fix:v1 agent=cdf4b39b2ce2ccb3eb5fe501acae77bb 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.