42 lines
1.3 KiB
Python
42 lines
1.3 KiB
Python
from __future__ import annotations
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from typing import TYPE_CHECKING
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from narwhals._duckdb.utils import native_to_narwhals_dtype
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from narwhals.dependencies import get_duckdb
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if TYPE_CHECKING:
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from types import ModuleType
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import duckdb
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from typing_extensions import Never
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from typing_extensions import Self
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from narwhals.dtypes import DType
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from narwhals.utils import Version
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class DuckDBInterchangeSeries:
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def __init__(self, df: duckdb.DuckDBPyRelation, version: Version) -> None:
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self._native_series = df
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self._version = version
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def __narwhals_series__(self) -> Self:
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return self
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def __native_namespace__(self) -> ModuleType:
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return get_duckdb() # type: ignore[no-any-return]
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@property
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def dtype(self) -> DType:
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return native_to_narwhals_dtype(self._native_series.types[0], self._version)
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def __getattr__(self, attr: str) -> Never:
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msg = ( # pragma: no cover
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f"Attribute {attr} is not supported for metadata-only dataframes.\n\n"
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"If you would like to see this kind of object better supported in "
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"Narwhals, please open a feature request "
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"at https://github.com/narwhals-dev/narwhals/issues."
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)
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raise NotImplementedError(msg) # pragma: no cover
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