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46 lines
1.2 KiB
46 lines
1.2 KiB
6 months ago
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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")
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def test_dataframe_arrow_interface():
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df = pd.DataFrame({"a": [1, 2, 3], "b": ["a", "b", "c"]})
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capsule = df.__arrow_c_stream__()
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assert (
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ctypes.pythonapi.PyCapsule_IsValid(
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ctypes.py_object(capsule), b"arrow_array_stream"
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)
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== 1
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)
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table = pa.table(df)
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expected = pa.table({"a": [1, 2, 3], "b": ["a", "b", "c"]})
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assert table.equals(expected)
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schema = pa.schema([("a", pa.int8()), ("b", pa.string())])
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table = pa.table(df, schema=schema)
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expected = expected.cast(schema)
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assert table.equals(expected)
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@td.skip_if_no("pyarrow", min_version="15.0")
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def test_dataframe_to_arrow():
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df = pd.DataFrame({"a": [1, 2, 3], "b": ["a", "b", "c"]})
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table = pa.RecordBatchReader.from_stream(df).read_all()
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expected = pa.table({"a": [1, 2, 3], "b": ["a", "b", "c"]})
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assert table.equals(expected)
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schema = pa.schema([("a", pa.int8()), ("b", pa.string())])
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table = pa.RecordBatchReader.from_stream(df, schema=schema).read_all()
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expected = expected.cast(schema)
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assert table.equals(expected)
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