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Backport PR #56587 on branch 2.2.x (ENH: support the Arrow PyCapsule …
…Interface on pandas.DataFrame (export)) (#56944) Backport PR #56587: ENH: support the Arrow PyCapsule Interface on pandas.DataFrame (export) Co-authored-by: Joris Van den Bossche <jorisvandenbossche@gmail.com>
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Original file line number | Diff line number | Diff line change |
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import ctypes | ||
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import pytest | ||
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import pandas.util._test_decorators as td | ||
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import pandas as pd | ||
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pa = pytest.importorskip("pyarrow") | ||
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@td.skip_if_no("pyarrow", min_version="14.0") | ||
def test_dataframe_arrow_interface(): | ||
df = pd.DataFrame({"a": [1, 2, 3], "b": ["a", "b", "c"]}) | ||
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capsule = df.__arrow_c_stream__() | ||
assert ( | ||
ctypes.pythonapi.PyCapsule_IsValid( | ||
ctypes.py_object(capsule), b"arrow_array_stream" | ||
) | ||
== 1 | ||
) | ||
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table = pa.table(df) | ||
expected = pa.table({"a": [1, 2, 3], "b": ["a", "b", "c"]}) | ||
assert table.equals(expected) | ||
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schema = pa.schema([("a", pa.int8()), ("b", pa.string())]) | ||
table = pa.table(df, schema=schema) | ||
expected = expected.cast(schema) | ||
assert table.equals(expected) | ||
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@td.skip_if_no("pyarrow", min_version="15.0") | ||
def test_dataframe_to_arrow(): | ||
df = pd.DataFrame({"a": [1, 2, 3], "b": ["a", "b", "c"]}) | ||
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table = pa.RecordBatchReader.from_stream(df) | ||
expected = pa.table({"a": [1, 2, 3], "b": ["a", "b", "c"]}) | ||
assert table.equals(expected) | ||
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schema = pa.schema([("a", pa.int8()), ("b", pa.string())]) | ||
table = pa.RecordBatchReader.from_stream(df, schema=schema) | ||
expected = expected.cast(schema) | ||
assert table.equals(expected) |
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