import numpy as np
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import pytest
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from pandas._libs.internals import BlockPlacement
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import pandas.util._test_decorators as td
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import pandas as pd
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from pandas.core.internals import BlockManager
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from pandas.core.internals.blocks import ExtensionBlock
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pytestmark = td.skip_array_manager_invalid_test
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class CustomBlock(ExtensionBlock):
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_holder = np.ndarray
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# Cannot override final attribute "_can_hold_na"
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@property # type: ignore[misc]
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def _can_hold_na(self) -> bool:
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return False
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@pytest.fixture
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def df():
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df1 = pd.DataFrame({"a": [1, 2, 3]})
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blocks = df1._mgr.blocks
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values = np.arange(3, dtype="int64")
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bp = BlockPlacement(slice(1, 2))
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custom_block = CustomBlock(values, placement=bp, ndim=2)
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blocks = blocks + (custom_block,)
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block_manager = BlockManager(blocks, [pd.Index(["a", "b"]), df1.index])
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return pd.DataFrame(block_manager)
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def test_concat_axis1(df):
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# GH17954
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df2 = pd.DataFrame({"c": [0.1, 0.2, 0.3]})
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res = pd.concat([df, df2], axis=1)
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assert isinstance(res._mgr.blocks[1], CustomBlock)
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