304 lines
9.4 KiB
Python
304 lines
9.4 KiB
Python
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""" test scalar indexing, including at and iat """
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from datetime import (
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datetime,
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timedelta,
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)
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import itertools
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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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Series,
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Timedelta,
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Timestamp,
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date_range,
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)
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import pandas._testing as tm
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def generate_indices(f, values=False):
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"""
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generate the indices
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if values is True , use the axis values
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is False, use the range
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"""
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axes = f.axes
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if values:
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axes = (list(range(len(ax))) for ax in axes)
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return itertools.product(*axes)
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class TestScalar:
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@pytest.mark.parametrize("kind", ["series", "frame"])
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@pytest.mark.parametrize("col", ["ints", "uints"])
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def test_iat_set_ints(self, kind, col, request):
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f = request.getfixturevalue(f"{kind}_{col}")
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indices = generate_indices(f, True)
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for i in indices:
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f.iat[i] = 1
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expected = f.values[i]
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tm.assert_almost_equal(expected, 1)
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@pytest.mark.parametrize("kind", ["series", "frame"])
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@pytest.mark.parametrize("col", ["labels", "ts", "floats"])
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def test_iat_set_other(self, kind, col, request):
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f = request.getfixturevalue(f"{kind}_{col}")
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msg = "iAt based indexing can only have integer indexers"
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with pytest.raises(ValueError, match=msg):
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idx = next(generate_indices(f, False))
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f.iat[idx] = 1
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@pytest.mark.parametrize("kind", ["series", "frame"])
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@pytest.mark.parametrize("col", ["ints", "uints", "labels", "ts", "floats"])
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def test_at_set_ints_other(self, kind, col, request):
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f = request.getfixturevalue(f"{kind}_{col}")
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indices = generate_indices(f, False)
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for i in indices:
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f.at[i] = 1
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expected = f.loc[i]
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tm.assert_almost_equal(expected, 1)
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class TestAtAndiAT:
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# at and iat tests that don't need Base class
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def test_float_index_at_iat(self):
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ser = Series([1, 2, 3], index=[0.1, 0.2, 0.3])
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for el, item in ser.items():
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assert ser.at[el] == item
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for i in range(len(ser)):
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assert ser.iat[i] == i + 1
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def test_at_iat_coercion(self):
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# as timestamp is not a tuple!
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dates = date_range("1/1/2000", periods=8)
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df = DataFrame(
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np.random.default_rng(2).standard_normal((8, 4)),
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index=dates,
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columns=["A", "B", "C", "D"],
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)
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s = df["A"]
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result = s.at[dates[5]]
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xp = s.values[5]
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assert result == xp
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@pytest.mark.parametrize(
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"ser, expected",
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[
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[
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Series(["2014-01-01", "2014-02-02"], dtype="datetime64[ns]"),
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Timestamp("2014-02-02"),
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],
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[
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Series(["1 days", "2 days"], dtype="timedelta64[ns]"),
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Timedelta("2 days"),
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],
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],
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)
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def test_iloc_iat_coercion_datelike(self, indexer_ial, ser, expected):
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# GH 7729
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# make sure we are boxing the returns
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result = indexer_ial(ser)[1]
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assert result == expected
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def test_imethods_with_dups(self):
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# GH6493
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# iat/iloc with dups
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s = Series(range(5), index=[1, 1, 2, 2, 3], dtype="int64")
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result = s.iloc[2]
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assert result == 2
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result = s.iat[2]
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assert result == 2
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msg = "index 10 is out of bounds for axis 0 with size 5"
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with pytest.raises(IndexError, match=msg):
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s.iat[10]
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msg = "index -10 is out of bounds for axis 0 with size 5"
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with pytest.raises(IndexError, match=msg):
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s.iat[-10]
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result = s.iloc[[2, 3]]
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expected = Series([2, 3], [2, 2], dtype="int64")
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tm.assert_series_equal(result, expected)
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df = s.to_frame()
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result = df.iloc[2]
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expected = Series(2, index=[0], name=2)
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tm.assert_series_equal(result, expected)
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result = df.iat[2, 0]
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assert result == 2
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def test_frame_at_with_duplicate_axes(self):
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# GH#33041
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arr = np.random.default_rng(2).standard_normal(6).reshape(3, 2)
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df = DataFrame(arr, columns=["A", "A"])
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result = df.at[0, "A"]
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expected = df.iloc[0].copy()
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tm.assert_series_equal(result, expected)
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result = df.T.at["A", 0]
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tm.assert_series_equal(result, expected)
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# setter
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df.at[1, "A"] = 2
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expected = Series([2.0, 2.0], index=["A", "A"], name=1)
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tm.assert_series_equal(df.iloc[1], expected)
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def test_at_getitem_dt64tz_values(self):
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# gh-15822
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df = DataFrame(
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{
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"name": ["John", "Anderson"],
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"date": [
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Timestamp(2017, 3, 13, 13, 32, 56),
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Timestamp(2017, 2, 16, 12, 10, 3),
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],
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}
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)
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df["date"] = df["date"].dt.tz_localize("Asia/Shanghai")
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expected = Timestamp("2017-03-13 13:32:56+0800", tz="Asia/Shanghai")
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result = df.loc[0, "date"]
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assert result == expected
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result = df.at[0, "date"]
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assert result == expected
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def test_mixed_index_at_iat_loc_iloc_series(self):
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# GH 19860
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s = Series([1, 2, 3, 4, 5], index=["a", "b", "c", 1, 2])
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for el, item in s.items():
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assert s.at[el] == s.loc[el] == item
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for i in range(len(s)):
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assert s.iat[i] == s.iloc[i] == i + 1
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with pytest.raises(KeyError, match="^4$"):
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s.at[4]
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with pytest.raises(KeyError, match="^4$"):
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s.loc[4]
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def test_mixed_index_at_iat_loc_iloc_dataframe(self):
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# GH 19860
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df = DataFrame(
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[[0, 1, 2, 3, 4], [5, 6, 7, 8, 9]], columns=["a", "b", "c", 1, 2]
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)
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for rowIdx, row in df.iterrows():
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for el, item in row.items():
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assert df.at[rowIdx, el] == df.loc[rowIdx, el] == item
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for row in range(2):
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for i in range(5):
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assert df.iat[row, i] == df.iloc[row, i] == row * 5 + i
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with pytest.raises(KeyError, match="^3$"):
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df.at[0, 3]
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with pytest.raises(KeyError, match="^3$"):
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df.loc[0, 3]
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def test_iat_setter_incompatible_assignment(self):
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# GH 23236
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result = DataFrame({"a": [0.0, 1.0], "b": [4, 5]})
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result.iat[0, 0] = None
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expected = DataFrame({"a": [None, 1], "b": [4, 5]})
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tm.assert_frame_equal(result, expected)
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def test_iat_dont_wrap_object_datetimelike():
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# GH#32809 .iat calls go through DataFrame._get_value, should not
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# call maybe_box_datetimelike
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dti = date_range("2016-01-01", periods=3)
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tdi = dti - dti
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ser = Series(dti.to_pydatetime(), dtype=object)
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ser2 = Series(tdi.to_pytimedelta(), dtype=object)
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df = DataFrame({"A": ser, "B": ser2})
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assert (df.dtypes == object).all()
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for result in [df.at[0, "A"], df.iat[0, 0], df.loc[0, "A"], df.iloc[0, 0]]:
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assert result is ser[0]
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assert isinstance(result, datetime)
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assert not isinstance(result, Timestamp)
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for result in [df.at[1, "B"], df.iat[1, 1], df.loc[1, "B"], df.iloc[1, 1]]:
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assert result is ser2[1]
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assert isinstance(result, timedelta)
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assert not isinstance(result, Timedelta)
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def test_at_with_tuple_index_get():
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# GH 26989
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# DataFrame.at getter works with Index of tuples
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df = DataFrame({"a": [1, 2]}, index=[(1, 2), (3, 4)])
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assert df.index.nlevels == 1
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assert df.at[(1, 2), "a"] == 1
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# Series.at getter works with Index of tuples
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series = df["a"]
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assert series.index.nlevels == 1
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assert series.at[(1, 2)] == 1
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@pytest.mark.filterwarnings("ignore:Setting a value on a view:FutureWarning")
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def test_at_with_tuple_index_set():
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# GH 26989
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# DataFrame.at setter works with Index of tuples
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df = DataFrame({"a": [1, 2]}, index=[(1, 2), (3, 4)])
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assert df.index.nlevels == 1
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df.at[(1, 2), "a"] = 2
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assert df.at[(1, 2), "a"] == 2
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# Series.at setter works with Index of tuples
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series = df["a"]
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assert series.index.nlevels == 1
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series.at[1, 2] = 3
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assert series.at[1, 2] == 3
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class TestMultiIndexScalar:
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def test_multiindex_at_get(self):
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# GH 26989
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# DataFrame.at and DataFrame.loc getter works with MultiIndex
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df = DataFrame({"a": [1, 2]}, index=[[1, 2], [3, 4]])
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assert df.index.nlevels == 2
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assert df.at[(1, 3), "a"] == 1
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assert df.loc[(1, 3), "a"] == 1
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# Series.at and Series.loc getter works with MultiIndex
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series = df["a"]
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assert series.index.nlevels == 2
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assert series.at[1, 3] == 1
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assert series.loc[1, 3] == 1
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@pytest.mark.filterwarnings("ignore:Setting a value on a view:FutureWarning")
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def test_multiindex_at_set(self):
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# GH 26989
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# DataFrame.at and DataFrame.loc setter works with MultiIndex
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df = DataFrame({"a": [1, 2]}, index=[[1, 2], [3, 4]])
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assert df.index.nlevels == 2
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df.at[(1, 3), "a"] = 3
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assert df.at[(1, 3), "a"] == 3
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df.loc[(1, 3), "a"] = 4
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assert df.loc[(1, 3), "a"] == 4
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# Series.at and Series.loc setter works with MultiIndex
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series = df["a"]
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assert series.index.nlevels == 2
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series.at[1, 3] = 5
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assert series.at[1, 3] == 5
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series.loc[1, 3] = 6
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assert series.loc[1, 3] == 6
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def test_multiindex_at_get_one_level(self):
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# GH#38053
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s2 = Series((0, 1), index=[[False, True]])
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result = s2.at[False]
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assert result == 0
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