import numpy as np
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import pytest
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from pandas import (
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DataFrame,
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Index,
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Series,
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)
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import pandas._testing as tm
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from pandas.tests.copy_view.util import get_array
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def index_view(index_data=[1, 2]):
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df = DataFrame({"a": index_data, "b": 1.5})
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view = df[:]
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df = df.set_index("a", drop=True)
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idx = df.index
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# df = None
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return idx, view
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def test_set_index_update_column(using_copy_on_write):
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df = DataFrame({"a": [1, 2], "b": 1})
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df = df.set_index("a", drop=False)
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expected = df.index.copy(deep=True)
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df.iloc[0, 0] = 100
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if using_copy_on_write:
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tm.assert_index_equal(df.index, expected)
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else:
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tm.assert_index_equal(df.index, Index([100, 2], name="a"))
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def test_set_index_drop_update_column(using_copy_on_write):
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df = DataFrame({"a": [1, 2], "b": 1.5})
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view = df[:]
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df = df.set_index("a", drop=True)
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expected = df.index.copy(deep=True)
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view.iloc[0, 0] = 100
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tm.assert_index_equal(df.index, expected)
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def test_set_index_series(using_copy_on_write):
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df = DataFrame({"a": [1, 2], "b": 1.5})
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ser = Series([10, 11])
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df = df.set_index(ser)
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expected = df.index.copy(deep=True)
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ser.iloc[0] = 100
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if using_copy_on_write:
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tm.assert_index_equal(df.index, expected)
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else:
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tm.assert_index_equal(df.index, Index([100, 11]))
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def test_assign_index_as_series(using_copy_on_write):
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df = DataFrame({"a": [1, 2], "b": 1.5})
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ser = Series([10, 11])
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df.index = ser
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expected = df.index.copy(deep=True)
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ser.iloc[0] = 100
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if using_copy_on_write:
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tm.assert_index_equal(df.index, expected)
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else:
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tm.assert_index_equal(df.index, Index([100, 11]))
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def test_assign_index_as_index(using_copy_on_write):
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df = DataFrame({"a": [1, 2], "b": 1.5})
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ser = Series([10, 11])
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rhs_index = Index(ser)
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df.index = rhs_index
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rhs_index = None # overwrite to clear reference
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expected = df.index.copy(deep=True)
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ser.iloc[0] = 100
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if using_copy_on_write:
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tm.assert_index_equal(df.index, expected)
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else:
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tm.assert_index_equal(df.index, Index([100, 11]))
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def test_index_from_series(using_copy_on_write):
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ser = Series([1, 2])
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idx = Index(ser)
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expected = idx.copy(deep=True)
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ser.iloc[0] = 100
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if using_copy_on_write:
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tm.assert_index_equal(idx, expected)
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else:
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tm.assert_index_equal(idx, Index([100, 2]))
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def test_index_from_series_copy(using_copy_on_write):
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ser = Series([1, 2])
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idx = Index(ser, copy=True) # noqa
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arr = get_array(ser)
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ser.iloc[0] = 100
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assert np.shares_memory(get_array(ser), arr)
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def test_index_from_index(using_copy_on_write):
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ser = Series([1, 2])
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idx = Index(ser)
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idx = Index(idx)
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expected = idx.copy(deep=True)
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ser.iloc[0] = 100
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if using_copy_on_write:
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tm.assert_index_equal(idx, expected)
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else:
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tm.assert_index_equal(idx, Index([100, 2]))
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@pytest.mark.parametrize(
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"func",
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[
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lambda x: x._shallow_copy(x._values),
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lambda x: x.view(),
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lambda x: x.take([0, 1]),
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lambda x: x.repeat([1, 1]),
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lambda x: x[slice(0, 2)],
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lambda x: x[[0, 1]],
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lambda x: x._getitem_slice(slice(0, 2)),
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lambda x: x.delete([]),
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lambda x: x.rename("b"),
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lambda x: x.astype("Int64", copy=False),
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],
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ids=[
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"_shallow_copy",
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"view",
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"take",
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"repeat",
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"getitem_slice",
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"getitem_list",
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"_getitem_slice",
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"delete",
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"rename",
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"astype",
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],
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)
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def test_index_ops(using_copy_on_write, func, request):
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idx, view_ = index_view()
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expected = idx.copy(deep=True)
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if "astype" in request.node.callspec.id:
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expected = expected.astype("Int64")
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idx = func(idx)
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view_.iloc[0, 0] = 100
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if using_copy_on_write:
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tm.assert_index_equal(idx, expected, check_names=False)
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def test_infer_objects(using_copy_on_write):
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idx, view_ = index_view(["a", "b"])
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expected = idx.copy(deep=True)
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idx = idx.infer_objects(copy=False)
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view_.iloc[0, 0] = "aaaa"
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if using_copy_on_write:
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tm.assert_index_equal(idx, expected, check_names=False)
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