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BUG: swapaxes creating result with read_only array (#51945)
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2 files changed

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pandas/core/generic.py

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@@ -751,7 +751,7 @@ def swapaxes(
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mapping = {i: j, j: i}
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new_axes = [self._get_axis(mapping.get(k, k)) for k in range(self._AXIS_LEN)]
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new_values = self.values.swapaxes(i, j)
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new_values = self._values.swapaxes(i, j) # type: ignore[union-attr]
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if (
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using_copy_on_write()
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and self._mgr.is_single_block

pandas/tests/copy_view/test_methods.py

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@@ -641,6 +641,14 @@ def test_swapaxes_single_block(using_copy_on_write):
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tm.assert_frame_equal(df, df_orig)
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def test_swapaxes_read_only_array():
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df = DataFrame({"a": [1, 2], "b": 3})
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df = df.swapaxes(axis1="index", axis2="columns")
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df.iloc[0, 0] = 100
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expected = DataFrame({0: [100, 3], 1: [2, 3]}, index=["a", "b"])
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tm.assert_frame_equal(df, expected)
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@pytest.mark.parametrize(
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"method, idx",
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[

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