mirror of
https://github.com/lancedb/lancedb.git
synced 2026-06-20 04:30:45 +00:00
b2ae763254
Closes #3502 ## Problem A bare, unparameterised `typing.List` / `typing.Tuple` field crashes `to_arrow_schema` with an opaque `AttributeError: __args__`: ```python from typing import Tuple from lancedb.pydantic import LanceModel class Doc(LanceModel): items: Tuple Doc.to_arrow_schema() # AttributeError: __args__ ``` In `_py_type_to_arrow_type`, the branch `elif getattr(py_type, "__origin__", None) in (list, tuple)` is taken for a bare generic (its `__origin__` is `list / tuple`), but the next line reads `py_type.__args__[0]`, and a bare generic has no `__args__`. Other unsupported types (e.g. `Dict[str, int]`) correctly raise a clear `TypeError`, so this case is inconsistent. Fix Guard the element-type lookup with `getattr(py_type, "__args__", None)` and raise a clear `TypeError` when it is missing, matching the existing behavior for other unsupported types. Bare builtin list / tuple are unaffected (their `__origin__` is `None`, so they already fall through to the existing `TypeError`). Testing - Added `test_bare_generic_raises_type_error` covering both `List` and `Tuple`. - ruff format and ruff check clean.
LanceDB Python SDK
A Python library for LanceDB.
Installation
pip install lancedb
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.