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394 lines
12 KiB
394 lines
12 KiB
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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MultiIndex,
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Series,
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)
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import pandas._testing as tm
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from pandas.core.indexing import IndexingError
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# ----------------------------------------------------------------------------
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# test indexing of Series with multi-level Index
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# ----------------------------------------------------------------------------
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@pytest.mark.parametrize(
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"access_method",
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[lambda s, x: s[:, x], lambda s, x: s.loc[:, x], lambda s, x: s.xs(x, level=1)],
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)
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@pytest.mark.parametrize(
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"level1_value, expected",
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[(0, Series([1], index=[0])), (1, Series([2, 3], index=[1, 2]))],
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)
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def test_series_getitem_multiindex(access_method, level1_value, expected):
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# GH 6018
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# series regression getitem with a multi-index
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mi = MultiIndex.from_tuples([(0, 0), (1, 1), (2, 1)], names=["A", "B"])
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ser = Series([1, 2, 3], index=mi)
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expected.index.name = "A"
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result = access_method(ser, level1_value)
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tm.assert_series_equal(result, expected)
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@pytest.mark.parametrize("level0_value", ["D", "A"])
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def test_series_getitem_duplicates_multiindex(level0_value):
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# GH 5725 the 'A' happens to be a valid Timestamp so the doesn't raise
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# the appropriate error, only in PY3 of course!
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index = MultiIndex(
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levels=[[level0_value, "B", "C"], [0, 26, 27, 37, 57, 67, 75, 82]],
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codes=[[0, 0, 0, 1, 2, 2, 2, 2, 2, 2], [1, 3, 4, 6, 0, 2, 2, 3, 5, 7]],
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names=["tag", "day"],
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)
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arr = np.random.randn(len(index), 1)
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df = DataFrame(arr, index=index, columns=["val"])
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# confirm indexing on missing value raises KeyError
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if level0_value != "A":
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with pytest.raises(KeyError, match=r"^'A'$"):
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df.val["A"]
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with pytest.raises(KeyError, match=r"^'X'$"):
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df.val["X"]
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result = df.val[level0_value]
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expected = Series(
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arr.ravel()[0:3], name="val", index=Index([26, 37, 57], name="day")
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)
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tm.assert_series_equal(result, expected)
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def test_series_getitem(multiindex_year_month_day_dataframe_random_data, indexer_sl):
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s = multiindex_year_month_day_dataframe_random_data["A"]
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expected = s.reindex(s.index[42:65])
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expected.index = expected.index.droplevel(0).droplevel(0)
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result = indexer_sl(s)[2000, 3]
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tm.assert_series_equal(result, expected)
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def test_series_getitem_returns_scalar(
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multiindex_year_month_day_dataframe_random_data, indexer_sl
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):
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s = multiindex_year_month_day_dataframe_random_data["A"]
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expected = s.iloc[49]
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result = indexer_sl(s)[2000, 3, 10]
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assert result == expected
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@pytest.mark.parametrize(
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"indexer,expected_error,expected_error_msg",
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[
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(lambda s: s.__getitem__((2000, 3, 4)), KeyError, r"^\(2000, 3, 4\)$"),
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(lambda s: s[(2000, 3, 4)], KeyError, r"^\(2000, 3, 4\)$"),
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(lambda s: s.loc[(2000, 3, 4)], KeyError, r"^\(2000, 3, 4\)$"),
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(lambda s: s.loc[(2000, 3, 4, 5)], IndexingError, "Too many indexers"),
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(lambda s: s.__getitem__(len(s)), KeyError, ""), # match should include len(s)
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(lambda s: s[len(s)], KeyError, ""), # match should include len(s)
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(
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lambda s: s.iloc[len(s)],
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IndexError,
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"single positional indexer is out-of-bounds",
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),
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],
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)
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def test_series_getitem_indexing_errors(
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multiindex_year_month_day_dataframe_random_data,
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indexer,
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expected_error,
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expected_error_msg,
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):
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s = multiindex_year_month_day_dataframe_random_data["A"]
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with pytest.raises(expected_error, match=expected_error_msg):
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indexer(s)
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def test_series_getitem_corner_generator(
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multiindex_year_month_day_dataframe_random_data,
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):
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s = multiindex_year_month_day_dataframe_random_data["A"]
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result = s[(x > 0 for x in s)]
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expected = s[s > 0]
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tm.assert_series_equal(result, expected)
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# ----------------------------------------------------------------------------
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# test indexing of DataFrame with multi-level Index
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# ----------------------------------------------------------------------------
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def test_getitem_simple(multiindex_dataframe_random_data):
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df = multiindex_dataframe_random_data.T
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expected = df.values[:, 0]
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result = df["foo", "one"].values
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tm.assert_almost_equal(result, expected)
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@pytest.mark.parametrize(
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"indexer,expected_error_msg",
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[
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(lambda df: df[("foo", "four")], r"^\('foo', 'four'\)$"),
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(lambda df: df["foobar"], r"^'foobar'$"),
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],
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)
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def test_frame_getitem_simple_key_error(
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multiindex_dataframe_random_data, indexer, expected_error_msg
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):
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df = multiindex_dataframe_random_data.T
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with pytest.raises(KeyError, match=expected_error_msg):
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indexer(df)
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def test_frame_getitem_multicolumn_empty_level():
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df = DataFrame({"a": ["1", "2", "3"], "b": ["2", "3", "4"]})
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df.columns = [
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["level1 item1", "level1 item2"],
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["", "level2 item2"],
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["level3 item1", "level3 item2"],
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]
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result = df["level1 item1"]
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expected = DataFrame(
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[["1"], ["2"], ["3"]], index=df.index, columns=["level3 item1"]
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)
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tm.assert_frame_equal(result, expected)
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@pytest.mark.parametrize(
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"indexer,expected_slice",
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[
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(lambda df: df["foo"], slice(3)),
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(lambda df: df["bar"], slice(3, 5)),
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(lambda df: df.loc[:, "bar"], slice(3, 5)),
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],
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)
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def test_frame_getitem_toplevel(
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multiindex_dataframe_random_data, indexer, expected_slice
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):
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df = multiindex_dataframe_random_data.T
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expected = df.reindex(columns=df.columns[expected_slice])
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expected.columns = expected.columns.droplevel(0)
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result = indexer(df)
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tm.assert_frame_equal(result, expected)
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def test_frame_mixed_depth_get():
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arrays = [
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["a", "top", "top", "routine1", "routine1", "routine2"],
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["", "OD", "OD", "result1", "result2", "result1"],
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["", "wx", "wy", "", "", ""],
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]
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tuples = sorted(zip(*arrays))
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index = MultiIndex.from_tuples(tuples)
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df = DataFrame(np.random.randn(4, 6), columns=index)
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result = df["a"]
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expected = df["a", "", ""].rename("a")
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tm.assert_series_equal(result, expected)
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result = df["routine1", "result1"]
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expected = df["routine1", "result1", ""]
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expected = expected.rename(("routine1", "result1"))
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tm.assert_series_equal(result, expected)
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def test_frame_getitem_nan_multiindex(nulls_fixture):
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# GH#29751
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# loc on a multiindex containing nan values
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n = nulls_fixture # for code readability
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cols = ["a", "b", "c"]
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df = DataFrame(
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[[11, n, 13], [21, n, 23], [31, n, 33], [41, n, 43]],
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columns=cols,
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).set_index(["a", "b"])
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df["c"] = df["c"].astype("int64")
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idx = (21, n)
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result = df.loc[:idx]
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expected = DataFrame([[11, n, 13], [21, n, 23]], columns=cols).set_index(["a", "b"])
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expected["c"] = expected["c"].astype("int64")
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tm.assert_frame_equal(result, expected)
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result = df.loc[idx:]
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expected = DataFrame(
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[[21, n, 23], [31, n, 33], [41, n, 43]], columns=cols
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).set_index(["a", "b"])
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expected["c"] = expected["c"].astype("int64")
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tm.assert_frame_equal(result, expected)
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idx1, idx2 = (21, n), (31, n)
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result = df.loc[idx1:idx2]
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expected = DataFrame([[21, n, 23], [31, n, 33]], columns=cols).set_index(["a", "b"])
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expected["c"] = expected["c"].astype("int64")
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tm.assert_frame_equal(result, expected)
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@pytest.mark.parametrize(
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"indexer,expected",
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[
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(
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(["b"], ["bar", np.nan]),
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(
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DataFrame(
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[[2, 3], [5, 6]],
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columns=MultiIndex.from_tuples([("b", "bar"), ("b", np.nan)]),
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dtype="int64",
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)
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),
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),
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(
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(["a", "b"]),
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(
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DataFrame(
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[[1, 2, 3], [4, 5, 6]],
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columns=MultiIndex.from_tuples(
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[("a", "foo"), ("b", "bar"), ("b", np.nan)]
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),
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dtype="int64",
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)
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),
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),
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(
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(["b"]),
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(
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DataFrame(
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[[2, 3], [5, 6]],
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columns=MultiIndex.from_tuples([("b", "bar"), ("b", np.nan)]),
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dtype="int64",
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)
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),
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),
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(
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(["b"], ["bar"]),
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(
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DataFrame(
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[[2], [5]],
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columns=MultiIndex.from_tuples([("b", "bar")]),
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dtype="int64",
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)
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),
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),
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(
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(["b"], [np.nan]),
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(
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DataFrame(
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[[3], [6]],
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columns=MultiIndex(
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codes=[[1], [-1]], levels=[["a", "b"], ["bar", "foo"]]
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),
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dtype="int64",
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)
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),
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),
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(("b", np.nan), Series([3, 6], dtype="int64", name=("b", np.nan))),
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],
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)
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def test_frame_getitem_nan_cols_multiindex(
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indexer,
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expected,
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nulls_fixture,
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):
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# Slicing MultiIndex including levels with nan values, for more information
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# see GH#25154
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df = DataFrame(
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[[1, 2, 3], [4, 5, 6]],
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columns=MultiIndex.from_tuples(
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[("a", "foo"), ("b", "bar"), ("b", nulls_fixture)]
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),
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dtype="int64",
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)
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result = df.loc[:, indexer]
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tm.assert_equal(result, expected)
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# ----------------------------------------------------------------------------
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# test indexing of DataFrame with multi-level Index with duplicates
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# ----------------------------------------------------------------------------
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@pytest.fixture
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def dataframe_with_duplicate_index():
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"""Fixture for DataFrame used in tests for gh-4145 and gh-4146"""
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data = [["a", "d", "e", "c", "f", "b"], [1, 4, 5, 3, 6, 2], [1, 4, 5, 3, 6, 2]]
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index = ["h1", "h3", "h5"]
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columns = MultiIndex(
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levels=[["A", "B"], ["A1", "A2", "B1", "B2"]],
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codes=[[0, 0, 0, 1, 1, 1], [0, 3, 3, 0, 1, 2]],
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names=["main", "sub"],
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)
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return DataFrame(data, index=index, columns=columns)
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@pytest.mark.parametrize(
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"indexer", [lambda df: df[("A", "A1")], lambda df: df.loc[:, ("A", "A1")]]
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)
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def test_frame_mi_access(dataframe_with_duplicate_index, indexer):
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# GH 4145
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df = dataframe_with_duplicate_index
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index = Index(["h1", "h3", "h5"])
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columns = MultiIndex.from_tuples([("A", "A1")], names=["main", "sub"])
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expected = DataFrame([["a", 1, 1]], index=columns, columns=index).T
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result = indexer(df)
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tm.assert_frame_equal(result, expected)
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def test_frame_mi_access_returns_series(dataframe_with_duplicate_index):
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# GH 4146, not returning a block manager when selecting a unique index
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# from a duplicate index
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# as of 4879, this returns a Series (which is similar to what happens
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# with a non-unique)
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df = dataframe_with_duplicate_index
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expected = Series(["a", 1, 1], index=["h1", "h3", "h5"], name="A1")
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result = df["A"]["A1"]
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tm.assert_series_equal(result, expected)
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def test_frame_mi_access_returns_frame(dataframe_with_duplicate_index):
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# selecting a non_unique from the 2nd level
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df = dataframe_with_duplicate_index
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expected = DataFrame(
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[["d", 4, 4], ["e", 5, 5]],
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index=Index(["B2", "B2"], name="sub"),
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columns=["h1", "h3", "h5"],
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).T
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result = df["A"]["B2"]
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tm.assert_frame_equal(result, expected)
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def test_frame_mi_empty_slice():
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# GH 15454
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df = DataFrame(0, index=range(2), columns=MultiIndex.from_product([[1], [2]]))
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result = df[[]]
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expected = DataFrame(
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index=[0, 1], columns=MultiIndex(levels=[[1], [2]], codes=[[], []])
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)
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tm.assert_frame_equal(result, expected)
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def test_loc_empty_multiindex():
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# GH#36936
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arrays = [["a", "a", "b", "a"], ["a", "a", "b", "b"]]
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index = MultiIndex.from_arrays(arrays, names=("idx1", "idx2"))
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df = DataFrame([1, 2, 3, 4], index=index, columns=["value"])
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# loc on empty multiindex == loc with False mask
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empty_multiindex = df.loc[df.loc[:, "value"] == 0, :].index
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result = df.loc[empty_multiindex, :]
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expected = df.loc[[False] * len(df.index), :]
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tm.assert_frame_equal(result, expected)
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# replacing value with loc on empty multiindex
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df.loc[df.loc[df.loc[:, "value"] == 0].index, "value"] = 5
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result = df
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expected = DataFrame([1, 2, 3, 4], index=index, columns=["value"])
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tm.assert_frame_equal(result, expected)
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