151 lines
4.7 KiB
Python
151 lines
4.7 KiB
Python
import pytest
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import pandas as pd
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from pandas import MultiIndex
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import pandas._testing as tm
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def check_level_names(index, names):
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assert [level.name for level in index.levels] == list(names)
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def test_slice_keep_name():
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x = MultiIndex.from_tuples([("a", "b"), (1, 2), ("c", "d")], names=["x", "y"])
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assert x[1:].names == x.names
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def test_index_name_retained():
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# GH9857
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result = pd.DataFrame({"x": [1, 2, 6], "y": [2, 2, 8], "z": [-5, 0, 5]})
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result = result.set_index("z")
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result.loc[10] = [9, 10]
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df_expected = pd.DataFrame(
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{"x": [1, 2, 6, 9], "y": [2, 2, 8, 10], "z": [-5, 0, 5, 10]}
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)
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df_expected = df_expected.set_index("z")
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tm.assert_frame_equal(result, df_expected)
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def test_changing_names(idx):
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assert [level.name for level in idx.levels] == ["first", "second"]
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view = idx.view()
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copy = idx.copy()
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shallow_copy = idx._shallow_copy()
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# changing names should not change level names on object
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new_names = [name + "a" for name in idx.names]
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idx.names = new_names
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check_level_names(idx, ["firsta", "seconda"])
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# and not on copies
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check_level_names(view, ["first", "second"])
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check_level_names(copy, ["first", "second"])
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check_level_names(shallow_copy, ["first", "second"])
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# and copies shouldn't change original
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shallow_copy.names = [name + "c" for name in shallow_copy.names]
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check_level_names(idx, ["firsta", "seconda"])
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def test_take_preserve_name(idx):
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taken = idx.take([3, 0, 1])
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assert taken.names == idx.names
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def test_copy_names():
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# Check that adding a "names" parameter to the copy is honored
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# GH14302
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multi_idx = pd.Index([(1, 2), (3, 4)], names=["MyName1", "MyName2"])
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multi_idx1 = multi_idx.copy()
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assert multi_idx.equals(multi_idx1)
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assert multi_idx.names == ["MyName1", "MyName2"]
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assert multi_idx1.names == ["MyName1", "MyName2"]
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multi_idx2 = multi_idx.copy(names=["NewName1", "NewName2"])
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assert multi_idx.equals(multi_idx2)
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assert multi_idx.names == ["MyName1", "MyName2"]
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assert multi_idx2.names == ["NewName1", "NewName2"]
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multi_idx3 = multi_idx.copy(name=["NewName1", "NewName2"])
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assert multi_idx.equals(multi_idx3)
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assert multi_idx.names == ["MyName1", "MyName2"]
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assert multi_idx3.names == ["NewName1", "NewName2"]
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# gh-35592
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with pytest.raises(ValueError, match="Length of new names must be 2, got 1"):
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multi_idx.copy(names=["mario"])
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with pytest.raises(TypeError, match="MultiIndex.name must be a hashable type"):
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multi_idx.copy(names=[["mario"], ["luigi"]])
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def test_names(idx, index_names):
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# names are assigned in setup
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assert index_names == ["first", "second"]
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level_names = [level.name for level in idx.levels]
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assert level_names == index_names
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# setting bad names on existing
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index = idx
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with pytest.raises(ValueError, match="^Length of names"):
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setattr(index, "names", list(index.names) + ["third"])
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with pytest.raises(ValueError, match="^Length of names"):
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setattr(index, "names", [])
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# initializing with bad names (should always be equivalent)
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major_axis, minor_axis = idx.levels
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major_codes, minor_codes = idx.codes
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with pytest.raises(ValueError, match="^Length of names"):
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MultiIndex(
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levels=[major_axis, minor_axis],
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codes=[major_codes, minor_codes],
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names=["first"],
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)
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with pytest.raises(ValueError, match="^Length of names"):
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MultiIndex(
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levels=[major_axis, minor_axis],
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codes=[major_codes, minor_codes],
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names=["first", "second", "third"],
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)
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# names are assigned on index, but not transferred to the levels
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index.names = ["a", "b"]
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level_names = [level.name for level in index.levels]
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assert level_names == ["a", "b"]
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def test_duplicate_level_names_access_raises(idx):
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# GH19029
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idx.names = ["foo", "foo"]
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with pytest.raises(ValueError, match="name foo occurs multiple times"):
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idx._get_level_number("foo")
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def test_get_names_from_levels():
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idx = MultiIndex.from_product([["a"], [1, 2]], names=["a", "b"])
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assert idx.levels[0].name == "a"
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assert idx.levels[1].name == "b"
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def test_setting_names_from_levels_raises():
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idx = MultiIndex.from_product([["a"], [1, 2]], names=["a", "b"])
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with pytest.raises(RuntimeError, match="set_names"):
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idx.levels[0].name = "foo"
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with pytest.raises(RuntimeError, match="set_names"):
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idx.levels[1].name = "foo"
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new = pd.Series(1, index=idx.levels[0])
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with pytest.raises(RuntimeError, match="set_names"):
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new.index.name = "bar"
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assert pd.Index._no_setting_name is False
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assert pd.Int64Index._no_setting_name is False
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assert pd.RangeIndex._no_setting_name is False
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