""" test label based indexing with loc """ from collections import namedtuple from datetime import ( date, datetime, time, timedelta, ) import re from dateutil.tz import gettz import numpy as np import pytest from pandas.errors import IndexingError import pandas.util._test_decorators as td import pandas as pd from pandas import ( Categorical, CategoricalDtype, CategoricalIndex, DataFrame, DatetimeIndex, Index, IndexSlice, MultiIndex, Period, PeriodIndex, Series, SparseDtype, Timedelta, Timestamp, date_range, timedelta_range, to_datetime, to_timedelta, ) import pandas._testing as tm from pandas.api.types import is_scalar from pandas.core.api import Float64Index from pandas.core.indexing import _one_ellipsis_message from pandas.tests.indexing.common import Base @pytest.mark.parametrize( "series, new_series, expected_ser", [ [[np.nan, np.nan, "b"], ["a", np.nan, np.nan], [False, True, True]], [[np.nan, "b"], ["a", np.nan], [False, True]], ], ) def test_not_change_nan_loc(series, new_series, expected_ser): # GH 28403 df = DataFrame({"A": series}) df.loc[:, "A"] = new_series expected = DataFrame({"A": expected_ser}) tm.assert_frame_equal(df.isna(), expected) tm.assert_frame_equal(df.notna(), ~expected) class TestLoc(Base): def test_loc_getitem_int(self): # int label self.check_result("loc", 2, typs=["labels"], fails=KeyError) def test_loc_getitem_label(self): # label self.check_result("loc", "c", typs=["empty"], fails=KeyError) @pytest.mark.parametrize( "key, typs, axes", [ ["f", ["ints", "uints", "labels", "mixed", "ts"], None], ["f", ["floats"], None], [20, ["ints", "uints", "mixed"], None], [20, ["labels"], None], [20, ["ts"], 0], [20, ["floats"], 0], ], ) def test_loc_getitem_label_out_of_range(self, key, typs, axes): # out of range label self.check_result("loc", key, typs=typs, axes=axes, fails=KeyError) @pytest.mark.parametrize( "key, typs", [ [[0, 1, 2], ["ints", "uints", "floats"]], [[1, 3.0, "A"], ["ints", "uints", "floats"]], ], ) def test_loc_getitem_label_list(self, key, typs): # list of labels self.check_result("loc", key, typs=typs, fails=KeyError) @pytest.mark.parametrize( "key, typs, axes", [ [[0, 1, 2], ["empty"], None], [[0, 2, 10], ["ints", "uints", "floats"], 0], [[3, 6, 7], ["ints", "uints", "floats"], 1], # GH 17758 - MultiIndex and missing keys [[(1, 3), (1, 4), (2, 5)], ["multi"], 0], ], ) def test_loc_getitem_label_list_with_missing(self, key, typs, axes): self.check_result("loc", key, typs=typs, axes=axes, fails=KeyError) def test_loc_getitem_label_list_fails(self): # fails self.check_result( "loc", [20, 30, 40], typs=["ints", "uints"], axes=1, fails=KeyError ) def test_loc_getitem_label_array_like(self): # TODO: test something? # array like pass def test_loc_getitem_bool(self): # boolean indexers b = [True, False, True, False] self.check_result("loc", b, typs=["empty"], fails=IndexError) @pytest.mark.parametrize( "slc, typs, axes, fails", [ [ slice(1, 3), ["labels", "mixed", "empty", "ts", "floats"], None, TypeError, ], [slice("20130102", "20130104"), ["ts"], 1, TypeError], [slice(2, 8), ["mixed"], 0, TypeError], [slice(2, 8), ["mixed"], 1, KeyError], [slice(2, 4, 2), ["mixed"], 0, TypeError], ], ) def test_loc_getitem_label_slice(self, slc, typs, axes, fails): # label slices (with ints) # real label slices # GH 14316 self.check_result( "loc", slc, typs=typs, axes=axes, fails=fails, ) def test_setitem_from_duplicate_axis(self): # GH#34034 df = DataFrame( [[20, "a"], [200, "a"], [200, "a"]], columns=["col1", "col2"], index=[10, 1, 1], ) df.loc[1, "col1"] = np.arange(2) expected = DataFrame( [[20, "a"], [0, "a"], [1, "a"]], columns=["col1", "col2"], index=[10, 1, 1] ) tm.assert_frame_equal(df, expected) def test_column_types_consistent(self): # GH 26779 df = DataFrame( data={ "channel": [1, 2, 3], "A": ["String 1", np.NaN, "String 2"], "B": [ Timestamp("2019-06-11 11:00:00"), pd.NaT, Timestamp("2019-06-11 12:00:00"), ], } ) df2 = DataFrame( data={"A": ["String 3"], "B": [Timestamp("2019-06-11 12:00:00")]} ) # Change Columns A and B to df2.values wherever Column A is NaN df.loc[df["A"].isna(), ["A", "B"]] = df2.values expected = DataFrame( data={ "channel": [1, 2, 3], "A": ["String 1", "String 3", "String 2"], "B": [ Timestamp("2019-06-11 11:00:00"), Timestamp("2019-06-11 12:00:00"), Timestamp("2019-06-11 12:00:00"), ], } ) tm.assert_frame_equal(df, expected) @pytest.mark.parametrize( "obj, key, exp", [ ( DataFrame([[1]], columns=Index([False])), IndexSlice[:, False], Series([1], name=False), ), (Series([1], index=Index([False])), False, [1]), (DataFrame([[1]], index=Index([False])), False, Series([1], name=False)), ], ) def test_loc_getitem_single_boolean_arg(self, obj, key, exp): # GH 44322 res = obj.loc[key] if isinstance(exp, (DataFrame, Series)): tm.assert_equal(res, exp) else: assert res == exp class TestLocBaseIndependent: # Tests for loc that do not depend on subclassing Base def test_loc_npstr(self): # GH#45580 df = DataFrame(index=date_range("2021", "2022")) result = df.loc[np.array(["2021/6/1"])[0] :] expected = df.iloc[151:] tm.assert_frame_equal(result, expected) @pytest.mark.parametrize( "msg, key", [ (r"Period\('2019', 'A-DEC'\), 'foo', 'bar'", (Period(2019), "foo", "bar")), (r"Period\('2019', 'A-DEC'\), 'y1', 'bar'", (Period(2019), "y1", "bar")), (r"Period\('2019', 'A-DEC'\), 'foo', 'z1'", (Period(2019), "foo", "z1")), ( r"Period\('2018', 'A-DEC'\), Period\('2016', 'A-DEC'\), 'bar'", (Period(2018), Period(2016), "bar"), ), (r"Period\('2018', 'A-DEC'\), 'foo', 'y1'", (Period(2018), "foo", "y1")), ( r"Period\('2017', 'A-DEC'\), 'foo', Period\('2015', 'A-DEC'\)", (Period(2017), "foo", Period(2015)), ), (r"Period\('2017', 'A-DEC'\), 'z1', 'bar'", (Period(2017), "z1", "bar")), ], ) def test_contains_raise_error_if_period_index_is_in_multi_index(self, msg, key): # GH#20684 """ parse_time_string return parameter if type not matched. PeriodIndex.get_loc takes returned value from parse_time_string as a tuple. If first argument is Period and a tuple has 3 items, process go on not raise exception """ df = DataFrame( { "A": [Period(2019), "x1", "x2"], "B": [Period(2018), Period(2016), "y1"], "C": [Period(2017), "z1", Period(2015)], "V1": [1, 2, 3], "V2": [10, 20, 30], } ).set_index(["A", "B", "C"]) with pytest.raises(KeyError, match=msg): df.loc[key] def test_loc_getitem_missing_unicode_key(self): df = DataFrame({"a": [1]}) with pytest.raises(KeyError, match="\u05d0"): df.loc[:, "\u05d0"] # should not raise UnicodeEncodeError def test_loc_getitem_dups(self): # GH 5678 # repeated getitems on a dup index returning a ndarray df = DataFrame( np.random.random_sample((20, 5)), index=["ABCDE"[x % 5] for x in range(20)] ) expected = df.loc["A", 0] result = df.loc[:, 0].loc["A"] tm.assert_series_equal(result, expected) def test_loc_getitem_dups2(self): # GH4726 # dup indexing with iloc/loc df = DataFrame( [[1, 2, "foo", "bar", Timestamp("20130101")]], columns=["a", "a", "a", "a", "a"], index=[1], ) expected = Series( [1, 2, "foo", "bar", Timestamp("20130101")], index=["a", "a", "a", "a", "a"], name=1, ) result = df.iloc[0] tm.assert_series_equal(result, expected) result = df.loc[1] tm.assert_series_equal(result, expected) def test_loc_setitem_dups(self): # GH 6541 df_orig = DataFrame( { "me": list("rttti"), "foo": list("aaade"), "bar": np.arange(5, dtype="float64") * 1.34 + 2, "bar2": np.arange(5, dtype="float64") * -0.34 + 2, } ).set_index("me") indexer = ( "r", ["bar", "bar2"], ) df = df_orig.copy() df.loc[indexer] *= 2.0 tm.assert_series_equal(df.loc[indexer], 2.0 * df_orig.loc[indexer]) indexer = ( "r", "bar", ) df = df_orig.copy() df.loc[indexer] *= 2.0 assert df.loc[indexer] == 2.0 * df_orig.loc[indexer] indexer = ( "t", ["bar", "bar2"], ) df = df_orig.copy() df.loc[indexer] *= 2.0 tm.assert_frame_equal(df.loc[indexer], 2.0 * df_orig.loc[indexer]) def test_loc_setitem_slice(self): # GH10503 # assigning the same type should not change the type df1 = DataFrame({"a": [0, 1, 1], "b": Series([100, 200, 300], dtype="uint32")}) ix = df1["a"] == 1 newb1 = df1.loc[ix, "b"] + 1 df1.loc[ix, "b"] = newb1 expected = DataFrame( {"a": [0, 1, 1], "b": Series([100, 201, 301], dtype="uint32")} ) tm.assert_frame_equal(df1, expected) # assigning a new type should get the inferred type df2 = DataFrame({"a": [0, 1, 1], "b": [100, 200, 300]}, dtype="uint64") ix = df1["a"] == 1 newb2 = df2.loc[ix, "b"] df1.loc[ix, "b"] = newb2 expected = DataFrame({"a": [0, 1, 1], "b": [100, 200, 300]}, dtype="uint64") tm.assert_frame_equal(df2, expected) def test_loc_setitem_dtype(self): # GH31340 df = DataFrame({"id": ["A"], "a": [1.2], "b": [0.0], "c": [-2.5]}) cols = ["a", "b", "c"] msg = "will attempt to set the values inplace instead" with tm.assert_produces_warning(DeprecationWarning, match=msg): df.loc[:, cols] = df.loc[:, cols].astype("float32") expected = DataFrame( { "id": ["A"], "a": np.array([1.2], dtype="float32"), "b": np.array([0.0], dtype="float32"), "c": np.array([-2.5], dtype="float32"), } ) # id is inferred as object tm.assert_frame_equal(df, expected) def test_getitem_label_list_with_missing(self): s = Series(range(3), index=["a", "b", "c"]) # consistency with pytest.raises(KeyError, match="not in index"): s[["a", "d"]] s = Series(range(3)) with pytest.raises(KeyError, match="not in index"): s[[0, 3]] @pytest.mark.parametrize("index", [[True, False], [True, False, True, False]]) def test_loc_getitem_bool_diff_len(self, index): # GH26658 s = Series([1, 2, 3]) msg = f"Boolean index has wrong length: {len(index)} instead of {len(s)}" with pytest.raises(IndexError, match=msg): s.loc[index] def test_loc_getitem_int_slice(self): # TODO: test something here? pass def test_loc_to_fail(self): # GH3449 df = DataFrame( np.random.random((3, 3)), index=["a", "b", "c"], columns=["e", "f", "g"] ) # raise a KeyError? msg = ( r"\"None of \[Int64Index\(\[1, 2\], dtype='int64'\)\] are " r"in the \[index\]\"" ) with pytest.raises(KeyError, match=msg): df.loc[[1, 2], [1, 2]] def test_loc_to_fail2(self): # GH 7496 # loc should not fallback s = Series(dtype=object) s.loc[1] = 1 s.loc["a"] = 2 with pytest.raises(KeyError, match=r"^-1$"): s.loc[-1] msg = ( r"\"None of \[Int64Index\(\[-1, -2\], dtype='int64'\)\] are " r"in the \[index\]\"" ) with pytest.raises(KeyError, match=msg): s.loc[[-1, -2]] msg = r"\"None of \[Index\(\['4'\], dtype='object'\)\] are in the \[index\]\"" with pytest.raises(KeyError, match=msg): s.loc[["4"]] s.loc[-1] = 3 with pytest.raises(KeyError, match="not in index"): s.loc[[-1, -2]] s["a"] = 2 msg = ( r"\"None of \[Int64Index\(\[-2\], dtype='int64'\)\] are " r"in the \[index\]\"" ) with pytest.raises(KeyError, match=msg): s.loc[[-2]] del s["a"] with pytest.raises(KeyError, match=msg): s.loc[[-2]] = 0 def test_loc_to_fail3(self): # inconsistency between .loc[values] and .loc[values,:] # GH 7999 df = DataFrame([["a"], ["b"]], index=[1, 2], columns=["value"]) msg = ( r"\"None of \[Int64Index\(\[3\], dtype='int64'\)\] are " r"in the \[index\]\"" ) with pytest.raises(KeyError, match=msg): df.loc[[3], :] with pytest.raises(KeyError, match=msg): df.loc[[3]] def test_loc_getitem_list_with_fail(self): # 15747 # should KeyError if *any* missing labels s = Series([1, 2, 3]) s.loc[[2]] with pytest.raises( KeyError, match=re.escape( "\"None of [Int64Index([3], dtype='int64')] are in the [index]\"" ), ): s.loc[[3]] # a non-match and a match with pytest.raises(KeyError, match="not in index"): s.loc[[2, 3]] def test_loc_index(self): # gh-17131 # a boolean index should index like a boolean numpy array df = DataFrame( np.random.random(size=(5, 10)), index=["alpha_0", "alpha_1", "alpha_2", "beta_0", "beta_1"], ) mask = df.index.map(lambda x: "alpha" in x) expected = df.loc[np.array(mask)] result = df.loc[mask] tm.assert_frame_equal(result, expected) result = df.loc[mask.values] tm.assert_frame_equal(result, expected) result = df.loc[pd.array(mask, dtype="boolean")] tm.assert_frame_equal(result, expected) def test_loc_general(self): df = DataFrame( np.random.rand(4, 4), columns=["A", "B", "C", "D"], index=["A", "B", "C", "D"], ) # want this to work result = df.loc[:, "A":"B"].iloc[0:2, :] assert (result.columns == ["A", "B"]).all() assert (result.index == ["A", "B"]).all() # mixed type result = DataFrame({"a": [Timestamp("20130101")], "b": [1]}).iloc[0] expected = Series([Timestamp("20130101"), 1], index=["a", "b"], name=0) tm.assert_series_equal(result, expected) assert result.dtype == object @pytest.fixture def frame_for_consistency(self): return DataFrame( { "date": date_range("2000-01-01", "2000-01-5"), "val": Series(range(5), dtype=np.int64), } ) @pytest.mark.parametrize( "val", [0, np.array(0, dtype=np.int64), np.array([0, 0, 0, 0, 0], dtype=np.int64)], ) def test_loc_setitem_consistency(self, frame_for_consistency, val): # GH 6149 # coerce similarly for setitem and loc when rows have a null-slice expected = DataFrame( { "date": Series(0, index=range(5), dtype=np.int64), "val": Series(range(5), dtype=np.int64), } ) df = frame_for_consistency.copy() df.loc[:, "date"] = val tm.assert_frame_equal(df, expected) def test_loc_setitem_consistency_dt64_to_str(self, frame_for_consistency): # GH 6149 # coerce similarly for setitem and loc when rows have a null-slice expected = DataFrame( { "date": Series("foo", index=range(5)), "val": Series(range(5), dtype=np.int64), } ) df = frame_for_consistency.copy() df.loc[:, "date"] = "foo" tm.assert_frame_equal(df, expected) def test_loc_setitem_consistency_dt64_to_float(self, frame_for_consistency): # GH 6149 # coerce similarly for setitem and loc when rows have a null-slice expected = DataFrame( { "date": Series(1.0, index=range(5)), "val": Series(range(5), dtype=np.int64), } ) df = frame_for_consistency.copy() df.loc[:, "date"] = 1.0 tm.assert_frame_equal(df, expected) def test_loc_setitem_consistency_single_row(self): # GH 15494 # setting on frame with single row df = DataFrame({"date": Series([Timestamp("20180101")])}) df.loc[:, "date"] = "string" expected = DataFrame({"date": Series(["string"])}) tm.assert_frame_equal(df, expected) def test_loc_setitem_consistency_empty(self): # empty (essentially noops) expected = DataFrame(columns=["x", "y"]) expected["x"] = expected["x"].astype(np.int64) df = DataFrame(columns=["x", "y"]) with tm.assert_produces_warning(None): df.loc[:, "x"] = 1 tm.assert_frame_equal(df, expected) df = DataFrame(columns=["x", "y"]) df["x"] = 1 tm.assert_frame_equal(df, expected) def test_loc_setitem_consistency_slice_column_len(self): # .loc[:,column] setting with slice == len of the column # GH10408 levels = [ ["Region_1"] * 4, ["Site_1", "Site_1", "Site_2", "Site_2"], [3987227376, 3980680971, 3977723249, 3977723089], ] mi = MultiIndex.from_arrays(levels, names=["Region", "Site", "RespondentID"]) clevels = [ ["Respondent", "Respondent", "Respondent", "OtherCat", "OtherCat"], ["Something", "StartDate", "EndDate", "Yes/No", "SomethingElse"], ] cols = MultiIndex.from_arrays(clevels, names=["Level_0", "Level_1"]) values = [ ["A", "5/25/2015 10:59", "5/25/2015 11:22", "Yes", np.nan], ["A", "5/21/2015 9:40", "5/21/2015 9:52", "Yes", "Yes"], ["A", "5/20/2015 8:27", "5/20/2015 8:41", "Yes", np.nan], ["A", "5/20/2015 8:33", "5/20/2015 9:09", "Yes", "No"], ] df = DataFrame(values, index=mi, columns=cols) msg = "will attempt to set the values inplace instead" with tm.assert_produces_warning(DeprecationWarning, match=msg): df.loc[:, ("Respondent", "StartDate")] = to_datetime( df.loc[:, ("Respondent", "StartDate")] ) with tm.assert_produces_warning(DeprecationWarning, match=msg): df.loc[:, ("Respondent", "EndDate")] = to_datetime( df.loc[:, ("Respondent", "EndDate")] ) with tm.assert_produces_warning(None, match=msg): # Adding a new key -> no warning df.loc[:, ("Respondent", "Duration")] = ( df.loc[:, ("Respondent", "EndDate")] - df.loc[:, ("Respondent", "StartDate")] ) with tm.assert_produces_warning(None, match=msg): # timedelta64[s] -> float64, so this cannot be done inplace, so # no warning df.loc[:, ("Respondent", "Duration")] = df.loc[ :, ("Respondent", "Duration") ].astype("timedelta64[s]") expected = Series( [1380, 720, 840, 2160.0], index=df.index, name=("Respondent", "Duration") ) tm.assert_series_equal(df[("Respondent", "Duration")], expected) @pytest.mark.parametrize("unit", ["Y", "M", "D", "h", "m", "s", "ms", "us"]) def test_loc_assign_non_ns_datetime(self, unit): # GH 27395, non-ns dtype assignment via .loc should work # and return the same result when using simple assignment df = DataFrame( { "timestamp": [ np.datetime64("2017-02-11 12:41:29"), np.datetime64("1991-11-07 04:22:37"), ] } ) df.loc[:, unit] = df.loc[:, "timestamp"].values.astype(f"datetime64[{unit}]") df["expected"] = df.loc[:, "timestamp"].values.astype(f"datetime64[{unit}]") expected = Series(df.loc[:, "expected"], name=unit) tm.assert_series_equal(df.loc[:, unit], expected) def test_loc_modify_datetime(self): # see gh-28837 df = DataFrame.from_dict( {"date": [1485264372711, 1485265925110, 1540215845888, 1540282121025]} ) df["date_dt"] = to_datetime(df["date"], unit="ms", cache=True) df.loc[:, "date_dt_cp"] = df.loc[:, "date_dt"] df.loc[[2, 3], "date_dt_cp"] = df.loc[[2, 3], "date_dt"] expected = DataFrame( [ [1485264372711, "2017-01-24 13:26:12.711", "2017-01-24 13:26:12.711"], [1485265925110, "2017-01-24 13:52:05.110", "2017-01-24 13:52:05.110"], [1540215845888, "2018-10-22 13:44:05.888", "2018-10-22 13:44:05.888"], [1540282121025, "2018-10-23 08:08:41.025", "2018-10-23 08:08:41.025"], ], columns=["date", "date_dt", "date_dt_cp"], ) columns = ["date_dt", "date_dt_cp"] expected[columns] = expected[columns].apply(to_datetime) tm.assert_frame_equal(df, expected) def test_loc_setitem_frame_with_reindex(self): # GH#6254 setting issue df = DataFrame(index=[3, 5, 4], columns=["A"], dtype=float) df.loc[[4, 3, 5], "A"] = np.array([1, 2, 3], dtype="int64") # setting integer values into a float dataframe with loc is inplace, # so we retain float dtype ser = Series([2, 3, 1], index=[3, 5, 4], dtype=float) expected = DataFrame({"A": ser}) tm.assert_frame_equal(df, expected) def test_loc_setitem_frame_with_reindex_mixed(self): # GH#40480 df = DataFrame(index=[3, 5, 4], columns=["A", "B"], dtype=float) df["B"] = "string" msg = "will attempt to set the values inplace instead" with tm.assert_produces_warning(DeprecationWarning, match=msg): df.loc[[4, 3, 5], "A"] = np.array([1, 2, 3], dtype="int64") ser = Series([2, 3, 1], index=[3, 5, 4], dtype="int64") expected = DataFrame({"A": ser}) expected["B"] = "string" tm.assert_frame_equal(df, expected) def test_loc_setitem_frame_with_inverted_slice(self): # GH#40480 df = DataFrame(index=[1, 2, 3], columns=["A", "B"], dtype=float) df["B"] = "string" msg = "will attempt to set the values inplace instead" with tm.assert_produces_warning(DeprecationWarning, match=msg): df.loc[slice(3, 0, -1), "A"] = np.array([1, 2, 3], dtype="int64") expected = DataFrame({"A": [3, 2, 1], "B": "string"}, index=[1, 2, 3]) tm.assert_frame_equal(df, expected) def test_loc_setitem_empty_frame(self): # GH#6252 setting with an empty frame keys1 = ["@" + str(i) for i in range(5)] val1 = np.arange(5, dtype="int64") keys2 = ["@" + str(i) for i in range(4)] val2 = np.arange(4, dtype="int64") index = list(set(keys1).union(keys2)) df = DataFrame(index=index) df["A"] = np.nan df.loc[keys1, "A"] = val1 df["B"] = np.nan df.loc[keys2, "B"] = val2 # Because df["A"] was initialized as float64, setting values into it # is inplace, so that dtype is retained sera = Series(val1, index=keys1, dtype=np.float64) serb = Series(val2, index=keys2) expected = DataFrame({"A": sera, "B": serb}).reindex(index=index) tm.assert_frame_equal(df, expected) def test_loc_setitem_frame(self): df = DataFrame(np.random.randn(4, 4), index=list("abcd"), columns=list("ABCD")) result = df.iloc[0, 0] df.loc["a", "A"] = 1 result = df.loc["a", "A"] assert result == 1 result = df.iloc[0, 0] assert result == 1 df.loc[:, "B":"D"] = 0 expected = df.loc[:, "B":"D"] result = df.iloc[:, 1:] tm.assert_frame_equal(result, expected) def test_loc_setitem_frame_nan_int_coercion_invalid(self): # GH 8669 # invalid coercion of nan -> int df = DataFrame({"A": [1, 2, 3], "B": np.nan}) df.loc[df.B > df.A, "B"] = df.A expected = DataFrame({"A": [1, 2, 3], "B": np.nan}) tm.assert_frame_equal(df, expected) def test_loc_setitem_frame_mixed_labels(self): # GH 6546 # setting with mixed labels df = DataFrame({1: [1, 2], 2: [3, 4], "a": ["a", "b"]}) result = df.loc[0, [1, 2]] expected = Series( [1, 3], index=Index([1, 2], dtype=object), dtype=object, name=0 ) tm.assert_series_equal(result, expected) expected = DataFrame({1: [5, 2], 2: [6, 4], "a": ["a", "b"]}) df.loc[0, [1, 2]] = [5, 6] tm.assert_frame_equal(df, expected) def test_loc_setitem_frame_multiples(self): # multiple setting df = DataFrame( {"A": ["foo", "bar", "baz"], "B": Series(range(3), dtype=np.int64)} ) rhs = df.loc[1:2] rhs.index = df.index[0:2] df.loc[0:1] = rhs expected = DataFrame( {"A": ["bar", "baz", "baz"], "B": Series([1, 2, 2], dtype=np.int64)} ) tm.assert_frame_equal(df, expected) # multiple setting with frame on rhs (with M8) df = DataFrame( { "date": date_range("2000-01-01", "2000-01-5"), "val": Series(range(5), dtype=np.int64), } ) expected = DataFrame( { "date": [ Timestamp("20000101"), Timestamp("20000102"), Timestamp("20000101"), Timestamp("20000102"), Timestamp("20000103"), ], "val": Series([0, 1, 0, 1, 2], dtype=np.int64), } ) rhs = df.loc[0:2] rhs.index = df.index[2:5] df.loc[2:4] = rhs tm.assert_frame_equal(df, expected) @pytest.mark.parametrize( "indexer", [["A"], slice(None, "A", None), np.array(["A"])] ) @pytest.mark.parametrize("value", [["Z"], np.array(["Z"])]) def test_loc_setitem_with_scalar_index(self, indexer, value): # GH #19474 # assigning like "df.loc[0, ['A']] = ['Z']" should be evaluated # elementwisely, not using "setter('A', ['Z'])". df = DataFrame([[1, 2], [3, 4]], columns=["A", "B"]) df.loc[0, indexer] = value result = df.loc[0, "A"] assert is_scalar(result) and result == "Z" @pytest.mark.parametrize( "index,box,expected", [ ( ([0, 2], ["A", "B", "C", "D"]), 7, DataFrame( [[7, 7, 7, 7], [3, 4, np.nan, np.nan], [7, 7, 7, 7]], columns=["A", "B", "C", "D"], ), ), ( (1, ["C", "D"]), [7, 8], DataFrame( [[1, 2, np.nan, np.nan], [3, 4, 7, 8], [5, 6, np.nan, np.nan]], columns=["A", "B", "C", "D"], ), ), ( (1, ["A", "B", "C"]), np.array([7, 8, 9], dtype=np.int64), DataFrame( [[1, 2, np.nan], [7, 8, 9], [5, 6, np.nan]], columns=["A", "B", "C"] ), ), ( (slice(1, 3, None), ["B", "C", "D"]), [[7, 8, 9], [10, 11, 12]], DataFrame( [[1, 2, np.nan, np.nan], [3, 7, 8, 9], [5, 10, 11, 12]], columns=["A", "B", "C", "D"], ), ), ( (slice(1, 3, None), ["C", "A", "D"]), np.array([[7, 8, 9], [10, 11, 12]], dtype=np.int64), DataFrame( [[1, 2, np.nan, np.nan], [8, 4, 7, 9], [11, 6, 10, 12]], columns=["A", "B", "C", "D"], ), ), ( (slice(None, None, None), ["A", "C"]), DataFrame([[7, 8], [9, 10], [11, 12]], columns=["A", "C"]), DataFrame( [[7, 2, 8], [9, 4, 10], [11, 6, 12]], columns=["A", "B", "C"] ), ), ], ) def test_loc_setitem_missing_columns(self, index, box, expected): # GH 29334 df = DataFrame([[1, 2], [3, 4], [5, 6]], columns=["A", "B"]) warn = None if isinstance(index[0], slice) and index[0] == slice(None): warn = DeprecationWarning msg = "will attempt to set the values inplace instead" with tm.assert_produces_warning(warn, match=msg): df.loc[index] = box tm.assert_frame_equal(df, expected) def test_loc_coercion(self): # GH#12411 df = DataFrame({"date": [Timestamp("20130101").tz_localize("UTC"), pd.NaT]}) expected = df.dtypes result = df.iloc[[0]] tm.assert_series_equal(result.dtypes, expected) result = df.iloc[[1]] tm.assert_series_equal(result.dtypes, expected) def test_loc_coercion2(self): # GH#12045 import datetime df = DataFrame( {"date": [datetime.datetime(2012, 1, 1), datetime.datetime(1012, 1, 2)]} ) expected = df.dtypes result = df.iloc[[0]] tm.assert_series_equal(result.dtypes, expected) result = df.iloc[[1]] tm.assert_series_equal(result.dtypes, expected) def test_loc_coercion3(self): # GH#11594 df = DataFrame({"text": ["some words"] + [None] * 9}) expected = df.dtypes result = df.iloc[0:2] tm.assert_series_equal(result.dtypes, expected) result = df.iloc[3:] tm.assert_series_equal(result.dtypes, expected) def test_setitem_new_key_tz(self, indexer_sl): # GH#12862 should not raise on assigning the second value vals = [ to_datetime(42).tz_localize("UTC"), to_datetime(666).tz_localize("UTC"), ] expected = Series(vals, index=["foo", "bar"]) ser = Series(dtype=object) indexer_sl(ser)["foo"] = vals[0] indexer_sl(ser)["bar"] = vals[1] tm.assert_series_equal(ser, expected) def test_loc_non_unique(self): # GH3659 # non-unique indexer with loc slice # https://groups.google.com/forum/?fromgroups#!topic/pydata/zTm2No0crYs # these are going to raise because the we are non monotonic df = DataFrame( {"A": [1, 2, 3, 4, 5, 6], "B": [3, 4, 5, 6, 7, 8]}, index=[0, 1, 0, 1, 2, 3] ) msg = "'Cannot get left slice bound for non-unique label: 1'" with pytest.raises(KeyError, match=msg): df.loc[1:] msg = "'Cannot get left slice bound for non-unique label: 0'" with pytest.raises(KeyError, match=msg): df.loc[0:] msg = "'Cannot get left slice bound for non-unique label: 1'" with pytest.raises(KeyError, match=msg): df.loc[1:2] # monotonic are ok df = DataFrame( {"A": [1, 2, 3, 4, 5, 6], "B": [3, 4, 5, 6, 7, 8]}, index=[0, 1, 0, 1, 2, 3] ).sort_index(axis=0) result = df.loc[1:] expected = DataFrame({"A": [2, 4, 5, 6], "B": [4, 6, 7, 8]}, index=[1, 1, 2, 3]) tm.assert_frame_equal(result, expected) result = df.loc[0:] tm.assert_frame_equal(result, df) result = df.loc[1:2] expected = DataFrame({"A": [2, 4, 5], "B": [4, 6, 7]}, index=[1, 1, 2]) tm.assert_frame_equal(result, expected) @pytest.mark.arm_slow @pytest.mark.parametrize("length, l2", [[900, 100], [900000, 100000]]) def test_loc_non_unique_memory_error(self, length, l2): # GH 4280 # non_unique index with a large selection triggers a memory error columns = list("ABCDEFG") df = pd.concat( [ DataFrame( np.random.randn(length, len(columns)), index=np.arange(length), columns=columns, ), DataFrame(np.ones((l2, len(columns))), index=[0] * l2, columns=columns), ] ) assert df.index.is_unique is False mask = np.arange(l2) result = df.loc[mask] expected = pd.concat( [ df.take([0]), DataFrame( np.ones((len(mask), len(columns))), index=[0] * len(mask), columns=columns, ), df.take(mask[1:]), ] ) tm.assert_frame_equal(result, expected) def test_loc_name(self): # GH 3880 df = DataFrame([[1, 1], [1, 1]]) df.index.name = "index_name" result = df.iloc[[0, 1]].index.name assert result == "index_name" result = df.loc[[0, 1]].index.name assert result == "index_name" def test_loc_empty_list_indexer_is_ok(self): df = tm.makeCustomDataframe(5, 2) # vertical empty tm.assert_frame_equal( df.loc[:, []], df.iloc[:, :0], check_index_type=True, check_column_type=True ) # horizontal empty tm.assert_frame_equal( df.loc[[], :], df.iloc[:0, :], check_index_type=True, check_column_type=True ) # horizontal empty tm.assert_frame_equal( df.loc[[]], df.iloc[:0, :], check_index_type=True, check_column_type=True ) def test_identity_slice_returns_new_object( self, using_array_manager, request, using_copy_on_write ): # GH13873 if using_array_manager: mark = pytest.mark.xfail( reason="setting with .loc[:, 'a'] does not alter inplace" ) request.node.add_marker(mark) original_df = DataFrame({"a": [1, 2, 3]}) sliced_df = original_df.loc[:] assert sliced_df is not original_df assert original_df[:] is not original_df # should be a shallow copy assert np.shares_memory(original_df["a"]._values, sliced_df["a"]._values) # Setting using .loc[:, "a"] sets inplace so alters both sliced and orig # depending on CoW original_df.loc[:, "a"] = [4, 4, 4] if using_copy_on_write: assert (sliced_df["a"] == [1, 2, 3]).all() else: assert (sliced_df["a"] == 4).all() # These should not return copies assert original_df is original_df.loc[:, :] df = DataFrame(np.random.randn(10, 4)) assert df[0] is df.loc[:, 0] # Same tests for Series original_series = Series([1, 2, 3, 4, 5, 6]) sliced_series = original_series.loc[:] assert sliced_series is not original_series assert original_series[:] is not original_series original_series[:3] = [7, 8, 9] if using_copy_on_write: assert all(sliced_series[:3] == [1, 2, 3]) else: assert all(sliced_series[:3] == [7, 8, 9]) @pytest.mark.xfail(reason="accidental fix reverted - GH37497") def test_loc_copy_vs_view(self): # GH 15631 x = DataFrame(zip(range(3), range(3)), columns=["a", "b"]) y = x.copy() q = y.loc[:, "a"] q += 2 tm.assert_frame_equal(x, y) z = x.copy() q = z.loc[x.index, "a"] q += 2 tm.assert_frame_equal(x, z) def test_loc_uint64(self): # GH20722 # Test whether loc accept uint64 max value as index. umax = np.iinfo("uint64").max ser = Series([1, 2], index=[umax - 1, umax]) result = ser.loc[umax - 1] expected = ser.iloc[0] assert result == expected result = ser.loc[[umax - 1]] expected = ser.iloc[[0]] tm.assert_series_equal(result, expected) result = ser.loc[[umax - 1, umax]] tm.assert_series_equal(result, ser) def test_loc_uint64_disallow_negative(self): # GH#41775 umax = np.iinfo("uint64").max ser = Series([1, 2], index=[umax - 1, umax]) with pytest.raises(KeyError, match="-1"): # don't wrap around ser.loc[-1] with pytest.raises(KeyError, match="-1"): # don't wrap around ser.loc[[-1]] # FIXME: warning issued here is false-positive @pytest.mark.filterwarnings("ignore:.*will attempt to set.*:FutureWarning") def test_loc_setitem_empty_append_expands_rows(self): # GH6173, various appends to an empty dataframe data = [1, 2, 3] expected = DataFrame({"x": data, "y": [None] * len(data)}) # appends to fit length of data df = DataFrame(columns=["x", "y"]) df.loc[:, "x"] = data tm.assert_frame_equal(df, expected) # FIXME: warning issued here is false-positive @pytest.mark.filterwarnings("ignore:.*will attempt to set.*:FutureWarning") def test_loc_setitem_empty_append_expands_rows_mixed_dtype(self): # GH#37932 same as test_loc_setitem_empty_append_expands_rows # but with mixed dtype so we go through take_split_path data = [1, 2, 3] expected = DataFrame({"x": data, "y": [None] * len(data)}) df = DataFrame(columns=["x", "y"]) df["x"] = df["x"].astype(np.int64) df.loc[:, "x"] = data tm.assert_frame_equal(df, expected) def test_loc_setitem_empty_append_single_value(self): # only appends one value expected = DataFrame({"x": [1.0], "y": [np.nan]}) df = DataFrame(columns=["x", "y"], dtype=float) df.loc[0, "x"] = expected.loc[0, "x"] tm.assert_frame_equal(df, expected) def test_loc_setitem_empty_append_raises(self): # GH6173, various appends to an empty dataframe data = [1, 2] df = DataFrame(columns=["x", "y"]) df.index = df.index.astype(np.int64) msg = ( r"None of \[Int64Index\(\[0, 1\], dtype='int64'\)\] " r"are in the \[index\]" ) with pytest.raises(KeyError, match=msg): df.loc[[0, 1], "x"] = data msg = "|".join( [ "cannot copy sequence with size 2 to array axis with dimension 0", r"could not broadcast input array from shape \(2,\) into shape \(0,\)", "Must have equal len keys and value when setting with an iterable", ] ) with pytest.raises(ValueError, match=msg): df.loc[0:2, "x"] = data def test_indexing_zerodim_np_array(self): # GH24924 df = DataFrame([[1, 2], [3, 4]]) result = df.loc[np.array(0)] s = Series([1, 2], name=0) tm.assert_series_equal(result, s) def test_series_indexing_zerodim_np_array(self): # GH24924 s = Series([1, 2]) result = s.loc[np.array(0)] assert result == 1 def test_loc_reverse_assignment(self): # GH26939 data = [1, 2, 3, 4, 5, 6] + [None] * 4 expected = Series(data, index=range(2010, 2020)) result = Series(index=range(2010, 2020), dtype=np.float64) result.loc[2015:2010:-1] = [6, 5, 4, 3, 2, 1] tm.assert_series_equal(result, expected) def test_loc_setitem_str_to_small_float_conversion_type(self): # GH#20388 np.random.seed(13) col_data = [str(np.random.random() * 1e-12) for _ in range(5)] result = DataFrame(col_data, columns=["A"]) expected = DataFrame(col_data, columns=["A"], dtype=object) tm.assert_frame_equal(result, expected) # assigning with loc/iloc attempts to set the values inplace, which # in this case is successful result.loc[result.index, "A"] = [float(x) for x in col_data] expected = DataFrame(col_data, columns=["A"], dtype=float).astype(object) tm.assert_frame_equal(result, expected) # assigning the entire column using __setitem__ swaps in the new array # GH#??? result["A"] = [float(x) for x in col_data] expected = DataFrame(col_data, columns=["A"], dtype=float) tm.assert_frame_equal(result, expected) def test_loc_getitem_time_object(self, frame_or_series): rng = date_range("1/1/2000", "1/5/2000", freq="5min") mask = (rng.hour == 9) & (rng.minute == 30) obj = DataFrame(np.random.randn(len(rng), 3), index=rng) obj = tm.get_obj(obj, frame_or_series) result = obj.loc[time(9, 30)] exp = obj.loc[mask] tm.assert_equal(result, exp) chunk = obj.loc["1/4/2000":] result = chunk.loc[time(9, 30)] expected = result[-1:] # Without resetting the freqs, these are 5 min and 1440 min, respectively result.index = result.index._with_freq(None) expected.index = expected.index._with_freq(None) tm.assert_equal(result, expected) @pytest.mark.parametrize("spmatrix_t", ["coo_matrix", "csc_matrix", "csr_matrix"]) @pytest.mark.parametrize("dtype", [np.int64, np.float64, complex]) @td.skip_if_no_scipy @pytest.mark.filterwarnings( # TODO(2.0): remove filtering; note only needed for using_array_manager "ignore:The behavior of .astype from SparseDtype.*FutureWarning" ) def test_loc_getitem_range_from_spmatrix(self, spmatrix_t, dtype): import scipy.sparse spmatrix_t = getattr(scipy.sparse, spmatrix_t) # The bug is triggered by a sparse matrix with purely sparse columns. So the # recipe below generates a rectangular matrix of dimension (5, 7) where all the # diagonal cells are ones, meaning the last two columns are purely sparse. rows, cols = 5, 7 spmatrix = spmatrix_t(np.eye(rows, cols, dtype=dtype), dtype=dtype) df = DataFrame.sparse.from_spmatrix(spmatrix) # regression test for GH#34526 itr_idx = range(2, rows) result = df.loc[itr_idx].values expected = spmatrix.toarray()[itr_idx] tm.assert_numpy_array_equal(result, expected) # regression test for GH#34540 result = df.loc[itr_idx].dtypes.values expected = np.full(cols, SparseDtype(dtype, fill_value=0)) tm.assert_numpy_array_equal(result, expected) def test_loc_getitem_listlike_all_retains_sparse(self): df = DataFrame({"A": pd.array([0, 0], dtype=SparseDtype("int64"))}) result = df.loc[[0, 1]] tm.assert_frame_equal(result, df) @td.skip_if_no_scipy def test_loc_getitem_sparse_frame(self): # GH34687 from scipy.sparse import eye df = DataFrame.sparse.from_spmatrix(eye(5)) result = df.loc[range(2)] expected = DataFrame( [[1.0, 0.0, 0.0, 0.0, 0.0], [0.0, 1.0, 0.0, 0.0, 0.0]], dtype=SparseDtype("float64", 0.0), ) tm.assert_frame_equal(result, expected) result = df.loc[range(2)].loc[range(1)] expected = DataFrame( [[1.0, 0.0, 0.0, 0.0, 0.0]], dtype=SparseDtype("float64", 0.0) ) tm.assert_frame_equal(result, expected) def test_loc_getitem_sparse_series(self): # GH34687 s = Series([1.0, 0.0, 0.0, 0.0, 0.0], dtype=SparseDtype("float64", 0.0)) result = s.loc[range(2)] expected = Series([1.0, 0.0], dtype=SparseDtype("float64", 0.0)) tm.assert_series_equal(result, expected) result = s.loc[range(3)].loc[range(2)] expected = Series([1.0, 0.0], dtype=SparseDtype("float64", 0.0)) tm.assert_series_equal(result, expected) @pytest.mark.parametrize("indexer", ["loc", "iloc"]) def test_getitem_single_row_sparse_df(self, indexer): # GH#46406 df = DataFrame([[1.0, 0.0, 1.5], [0.0, 2.0, 0.0]], dtype=SparseDtype(float)) result = getattr(df, indexer)[0] expected = Series([1.0, 0.0, 1.5], dtype=SparseDtype(float), name=0) tm.assert_series_equal(result, expected) @pytest.mark.parametrize("key_type", [iter, np.array, Series, Index]) def test_loc_getitem_iterable(self, float_frame, key_type): idx = key_type(["A", "B", "C"]) result = float_frame.loc[:, idx] expected = float_frame.loc[:, ["A", "B", "C"]] tm.assert_frame_equal(result, expected) def test_loc_getitem_timedelta_0seconds(self): # GH#10583 df = DataFrame(np.random.normal(size=(10, 4))) df.index = timedelta_range(start="0s", periods=10, freq="s") expected = df.loc[Timedelta("0s") :, :] result = df.loc["0s":, :] tm.assert_frame_equal(result, expected) @pytest.mark.parametrize( "val,expected", [(2**63 - 1, Series([1])), (2**63, Series([2]))] ) def test_loc_getitem_uint64_scalar(self, val, expected): # see GH#19399 df = DataFrame([1, 2], index=[2**63 - 1, 2**63]) result = df.loc[val] expected.name = val tm.assert_series_equal(result, expected) def test_loc_setitem_int_label_with_float64index(self): # note labels are floats ser = Series(["a", "b", "c"], index=[0, 0.5, 1]) expected = ser.copy() ser.loc[1] = "zoo" expected.iloc[2] = "zoo" tm.assert_series_equal(ser, expected) @pytest.mark.parametrize( "indexer, expected", [ # The test name is a misnomer in the 0 case as df.index[indexer] # is a scalar. (0, [20, 1, 2, 3, 4, 5, 6, 7, 8, 9]), (slice(4, 8), [0, 1, 2, 3, 20, 20, 20, 20, 8, 9]), ([3, 5], [0, 1, 2, 20, 4, 20, 6, 7, 8, 9]), ], ) def test_loc_setitem_listlike_with_timedelta64index(self, indexer, expected): # GH#16637 tdi = to_timedelta(range(10), unit="s") df = DataFrame({"x": range(10)}, dtype="int64", index=tdi) df.loc[df.index[indexer], "x"] = 20 expected = DataFrame( expected, index=tdi, columns=["x"], dtype="int64", ) tm.assert_frame_equal(expected, df) def test_loc_setitem_categorical_values_partial_column_slice(self): # Assigning a Category to parts of a int/... column uses the values of # the Categorical df = DataFrame({"a": [1, 1, 1, 1, 1], "b": list("aaaaa")}) exp = DataFrame({"a": [1, "b", "b", 1, 1], "b": list("aabba")}) df.loc[1:2, "a"] = Categorical(["b", "b"], categories=["a", "b"]) df.loc[2:3, "b"] = Categorical(["b", "b"], categories=["a", "b"]) tm.assert_frame_equal(df, exp) def test_loc_setitem_single_row_categorical(self): # GH#25495 df = DataFrame({"Alpha": ["a"], "Numeric": [0]}) categories = Categorical(df["Alpha"], categories=["a", "b", "c"]) msg = "will attempt to set the values inplace instead" with tm.assert_produces_warning(DeprecationWarning, match=msg): df.loc[:, "Alpha"] = categories result = df["Alpha"] expected = Series(categories, index=df.index, name="Alpha") tm.assert_series_equal(result, expected) def test_loc_setitem_datetime_coercion(self): # GH#1048 df = DataFrame({"c": [Timestamp("2010-10-01")] * 3}) df.loc[0:1, "c"] = np.datetime64("2008-08-08") assert Timestamp("2008-08-08") == df.loc[0, "c"] assert Timestamp("2008-08-08") == df.loc[1, "c"] df.loc[2, "c"] = date(2005, 5, 5) with tm.assert_produces_warning(FutureWarning): # Comparing Timestamp to date obj is deprecated assert Timestamp("2005-05-05") == df.loc[2, "c"] assert Timestamp("2005-05-05").date() == df.loc[2, "c"] @pytest.mark.parametrize("idxer", ["var", ["var"]]) def test_loc_setitem_datetimeindex_tz(self, idxer, tz_naive_fixture): # GH#11365 tz = tz_naive_fixture idx = date_range(start="2015-07-12", periods=3, freq="H", tz=tz) expected = DataFrame(1.2, index=idx, columns=["var"]) # if result started off with object dtype, then the .loc.__setitem__ # below would retain object dtype result = DataFrame(index=idx, columns=["var"], dtype=np.float64) result.loc[:, idxer] = expected tm.assert_frame_equal(result, expected) def test_loc_setitem_time_key(self, using_array_manager): index = date_range("2012-01-01", "2012-01-05", freq="30min") df = DataFrame(np.random.randn(len(index), 5), index=index) akey = time(12, 0, 0) bkey = slice(time(13, 0, 0), time(14, 0, 0)) ainds = [24, 72, 120, 168] binds = [26, 27, 28, 74, 75, 76, 122, 123, 124, 170, 171, 172] result = df.copy() result.loc[akey] = 0 result = result.loc[akey] expected = df.loc[akey].copy() expected.loc[:] = 0 if using_array_manager: # TODO(ArrayManager) we are still overwriting columns expected = expected.astype(float) tm.assert_frame_equal(result, expected) result = df.copy() result.loc[akey] = 0 result.loc[akey] = df.iloc[ainds] tm.assert_frame_equal(result, df) result = df.copy() result.loc[bkey] = 0 result = result.loc[bkey] expected = df.loc[bkey].copy() expected.loc[:] = 0 if using_array_manager: # TODO(ArrayManager) we are still overwriting columns expected = expected.astype(float) tm.assert_frame_equal(result, expected) result = df.copy() result.loc[bkey] = 0 result.loc[bkey] = df.iloc[binds] tm.assert_frame_equal(result, df) @pytest.mark.parametrize("key", ["A", ["A"], ("A", slice(None))]) def test_loc_setitem_unsorted_multiindex_columns(self, key): # GH#38601 mi = MultiIndex.from_tuples([("A", 4), ("B", "3"), ("A", "2")]) df = DataFrame([[1, 2, 3], [4, 5, 6]], columns=mi) obj = df.copy() obj.loc[:, key] = np.zeros((2, 2), dtype=int) expected = DataFrame([[0, 2, 0], [0, 5, 0]], columns=mi) tm.assert_frame_equal(obj, expected) df = df.sort_index(axis=1) df.loc[:, key] = np.zeros((2, 2), dtype=int) expected = expected.sort_index(axis=1) tm.assert_frame_equal(df, expected) def test_loc_setitem_uint_drop(self, any_int_numpy_dtype): # see GH#18311 # assigning series.loc[0] = 4 changed series.dtype to int series = Series([1, 2, 3], dtype=any_int_numpy_dtype) series.loc[0] = 4 expected = Series([4, 2, 3], dtype=any_int_numpy_dtype) tm.assert_series_equal(series, expected) def test_loc_setitem_td64_non_nano(self): # GH#14155 ser = Series(10 * [np.timedelta64(10, "m")]) ser.loc[[1, 2, 3]] = np.timedelta64(20, "m") expected = Series(10 * [np.timedelta64(10, "m")]) expected.loc[[1, 2, 3]] = Timedelta(np.timedelta64(20, "m")) tm.assert_series_equal(ser, expected) def test_loc_setitem_2d_to_1d_raises(self): data = np.random.randn(2, 2) ser = Series(range(2)) msg = "|".join( [ r"shape mismatch: value array of shape \(2,2\)", r"cannot reshape array of size 4 into shape \(2,\)", ] ) with pytest.raises(ValueError, match=msg): ser.loc[range(2)] = data msg = r"could not broadcast input array from shape \(2,2\) into shape \(2,?\)" with pytest.raises(ValueError, match=msg): ser.loc[:] = data def test_loc_getitem_interval_index(self): # GH#19977 index = pd.interval_range(start=0, periods=3) df = DataFrame( [[1, 2, 3], [4, 5, 6], [7, 8, 9]], index=index, columns=["A", "B", "C"] ) expected = 1 result = df.loc[0.5, "A"] tm.assert_almost_equal(result, expected) def test_loc_getitem_interval_index2(self): # GH#19977 index = pd.interval_range(start=0, periods=3, closed="both") df = DataFrame( [[1, 2, 3], [4, 5, 6], [7, 8, 9]], index=index, columns=["A", "B", "C"] ) index_exp = pd.interval_range(start=0, periods=2, freq=1, closed="both") expected = Series([1, 4], index=index_exp, name="A") result = df.loc[1, "A"] tm.assert_series_equal(result, expected) @pytest.mark.parametrize("tpl", [(1,), (1, 2)]) def test_loc_getitem_index_single_double_tuples(self, tpl): # GH#20991 idx = Index( [(1,), (1, 2)], name="A", tupleize_cols=False, ) df = DataFrame(index=idx) result = df.loc[[tpl]] idx = Index([tpl], name="A", tupleize_cols=False) expected = DataFrame(index=idx) tm.assert_frame_equal(result, expected) def test_loc_getitem_index_namedtuple(self): IndexType = namedtuple("IndexType", ["a", "b"]) idx1 = IndexType("foo", "bar") idx2 = IndexType("baz", "bof") index = Index([idx1, idx2], name="composite_index", tupleize_cols=False) df = DataFrame([(1, 2), (3, 4)], index=index, columns=["A", "B"]) result = df.loc[IndexType("foo", "bar")]["A"] assert result == 1 def test_loc_setitem_single_column_mixed(self): df = DataFrame( np.random.randn(5, 3), index=["a", "b", "c", "d", "e"], columns=["foo", "bar", "baz"], ) df["str"] = "qux" df.loc[df.index[::2], "str"] = np.nan expected = np.array([np.nan, "qux", np.nan, "qux", np.nan], dtype=object) tm.assert_almost_equal(df["str"].values, expected) def test_loc_setitem_cast2(self): # GH#7704 # dtype conversion on setting df = DataFrame(np.random.rand(30, 3), columns=tuple("ABC")) df["event"] = np.nan df.loc[10, "event"] = "foo" result = df.dtypes expected = Series( [np.dtype("float64")] * 3 + [np.dtype("object")], index=["A", "B", "C", "event"], ) tm.assert_series_equal(result, expected) def test_loc_setitem_cast3(self): # Test that data type is preserved . GH#5782 df = DataFrame({"one": np.arange(6, dtype=np.int8)}) df.loc[1, "one"] = 6 assert df.dtypes.one == np.dtype(np.int8) df.one = np.int8(7) assert df.dtypes.one == np.dtype(np.int8) def test_loc_setitem_range_key(self, frame_or_series): # GH#45479 don't treat range key as positional obj = frame_or_series(range(5), index=[3, 4, 1, 0, 2]) values = [9, 10, 11] if obj.ndim == 2: values = [[9], [10], [11]] obj.loc[range(3)] = values expected = frame_or_series([0, 1, 10, 9, 11], index=obj.index) tm.assert_equal(obj, expected) class TestLocWithEllipsis: @pytest.fixture(params=[tm.loc, tm.iloc]) def indexer(self, request): # Test iloc while we're here return request.param @pytest.fixture def obj(self, series_with_simple_index, frame_or_series): obj = series_with_simple_index if frame_or_series is not Series: obj = obj.to_frame() return obj def test_loc_iloc_getitem_ellipsis(self, obj, indexer): result = indexer(obj)[...] tm.assert_equal(result, obj) def test_loc_iloc_getitem_leading_ellipses(self, series_with_simple_index, indexer): obj = series_with_simple_index key = 0 if (indexer is tm.iloc or len(obj) == 0) else obj.index[0] if indexer is tm.loc and obj.index.is_boolean(): # passing [False] will get interpreted as a boolean mask # TODO: should it? unambiguous when lengths dont match? return if indexer is tm.loc and isinstance(obj.index, MultiIndex): msg = "MultiIndex does not support indexing with Ellipsis" with pytest.raises(NotImplementedError, match=msg): result = indexer(obj)[..., [key]] elif len(obj) != 0: result = indexer(obj)[..., [key]] expected = indexer(obj)[[key]] tm.assert_series_equal(result, expected) key2 = 0 if indexer is tm.iloc else obj.name df = obj.to_frame() result = indexer(df)[..., [key2]] expected = indexer(df)[:, [key2]] tm.assert_frame_equal(result, expected) def test_loc_iloc_getitem_ellipses_only_one_ellipsis(self, obj, indexer): # GH37750 key = 0 if (indexer is tm.iloc or len(obj) == 0) else obj.index[0] with pytest.raises(IndexingError, match=_one_ellipsis_message): indexer(obj)[..., ...] with pytest.raises(IndexingError, match=_one_ellipsis_message): indexer(obj)[..., [key], ...] with pytest.raises(IndexingError, match=_one_ellipsis_message): indexer(obj)[..., ..., key] # one_ellipsis_message takes precedence over "Too many indexers" # only when the first key is Ellipsis with pytest.raises(IndexingError, match="Too many indexers"): indexer(obj)[key, ..., ...] class TestLocWithMultiIndex: @pytest.mark.parametrize( "keys, expected", [ (["b", "a"], [["b", "b", "a", "a"], [1, 2, 1, 2]]), (["a", "b"], [["a", "a", "b", "b"], [1, 2, 1, 2]]), ((["a", "b"], [1, 2]), [["a", "a", "b", "b"], [1, 2, 1, 2]]), ((["a", "b"], [2, 1]), [["a", "a", "b", "b"], [2, 1, 2, 1]]), ((["b", "a"], [2, 1]), [["b", "b", "a", "a"], [2, 1, 2, 1]]), ((["b", "a"], [1, 2]), [["b", "b", "a", "a"], [1, 2, 1, 2]]), ((["c", "a"], [2, 1]), [["c", "a", "a"], [1, 2, 1]]), ], ) @pytest.mark.parametrize("dim", ["index", "columns"]) def test_loc_getitem_multilevel_index_order(self, dim, keys, expected): # GH#22797 # Try to respect order of keys given for MultiIndex.loc kwargs = {dim: [["c", "a", "a", "b", "b"], [1, 1, 2, 1, 2]]} df = DataFrame(np.arange(25).reshape(5, 5), **kwargs) exp_index = MultiIndex.from_arrays(expected) if dim == "index": res = df.loc[keys, :] tm.assert_index_equal(res.index, exp_index) elif dim == "columns": res = df.loc[:, keys] tm.assert_index_equal(res.columns, exp_index) def test_loc_preserve_names(self, multiindex_year_month_day_dataframe_random_data): ymd = multiindex_year_month_day_dataframe_random_data result = ymd.loc[2000] result2 = ymd["A"].loc[2000] assert result.index.names == ymd.index.names[1:] assert result2.index.names == ymd.index.names[1:] result = ymd.loc[2000, 2] result2 = ymd["A"].loc[2000, 2] assert result.index.name == ymd.index.names[2] assert result2.index.name == ymd.index.names[2] def test_loc_getitem_multiindex_nonunique_len_zero(self): # GH#13691 mi = MultiIndex.from_product([[0], [1, 1]]) ser = Series(0, index=mi) res = ser.loc[[]] expected = ser[:0] tm.assert_series_equal(res, expected) res2 = ser.loc[ser.iloc[0:0]] tm.assert_series_equal(res2, expected) def test_loc_getitem_access_none_value_in_multiindex(self): # GH#34318: test that you can access a None value using .loc # through a Multiindex ser = Series([None], MultiIndex.from_arrays([["Level1"], ["Level2"]])) result = ser.loc[("Level1", "Level2")] assert result is None midx = MultiIndex.from_product([["Level1"], ["Level2_a", "Level2_b"]]) ser = Series([None] * len(midx), dtype=object, index=midx) result = ser.loc[("Level1", "Level2_a")] assert result is None ser = Series([1] * len(midx), dtype=object, index=midx) result = ser.loc[("Level1", "Level2_a")] assert result == 1 def test_loc_setitem_multiindex_slice(self): # GH 34870 index = MultiIndex.from_tuples( zip( ["bar", "bar", "baz", "baz", "foo", "foo", "qux", "qux"], ["one", "two", "one", "two", "one", "two", "one", "two"], ), names=["first", "second"], ) result = Series([1, 1, 1, 1, 1, 1, 1, 1], index=index) result.loc[("baz", "one"):("foo", "two")] = 100 expected = Series([1, 1, 100, 100, 100, 100, 1, 1], index=index) tm.assert_series_equal(result, expected) def test_loc_getitem_slice_datetime_objs_with_datetimeindex(self): times = date_range("2000-01-01", freq="10min", periods=100000) ser = Series(range(100000), times) result = ser.loc[datetime(1900, 1, 1) : datetime(2100, 1, 1)] tm.assert_series_equal(result, ser) def test_loc_getitem_datetime_string_with_datetimeindex(self): # GH 16710 df = DataFrame( {"a": range(10), "b": range(10)}, index=date_range("2010-01-01", "2010-01-10"), ) result = df.loc[["2010-01-01", "2010-01-05"], ["a", "b"]] expected = DataFrame( {"a": [0, 4], "b": [0, 4]}, index=DatetimeIndex(["2010-01-01", "2010-01-05"]), ) tm.assert_frame_equal(result, expected) def test_loc_getitem_sorted_index_level_with_duplicates(self): # GH#4516 sorting a MultiIndex with duplicates and multiple dtypes mi = MultiIndex.from_tuples( [ ("foo", "bar"), ("foo", "bar"), ("bah", "bam"), ("bah", "bam"), ("foo", "bar"), ("bah", "bam"), ], names=["A", "B"], ) df = DataFrame( [ [1.0, 1], [2.0, 2], [3.0, 3], [4.0, 4], [5.0, 5], [6.0, 6], ], index=mi, columns=["C", "D"], ) df = df.sort_index(level=0) expected = DataFrame( [[1.0, 1], [2.0, 2], [5.0, 5]], columns=["C", "D"], index=mi.take([0, 1, 4]) ) result = df.loc[("foo", "bar")] tm.assert_frame_equal(result, expected) def test_additional_element_to_categorical_series_loc(self): # GH#47677 result = Series(["a", "b", "c"], dtype="category") result.loc[3] = 0 expected = Series(["a", "b", "c", 0], dtype="object") tm.assert_series_equal(result, expected) def test_additional_categorical_element_loc(self): # GH#47677 result = Series(["a", "b", "c"], dtype="category") result.loc[3] = "a" expected = Series(["a", "b", "c", "a"], dtype="category") tm.assert_series_equal(result, expected) def test_loc_set_nan_in_categorical_series(self, any_numeric_ea_dtype): # GH#47677 srs = Series( [1, 2, 3], dtype=CategoricalDtype(Index([1, 2, 3], dtype=any_numeric_ea_dtype)), ) # enlarge srs.loc[3] = np.nan expected = Series( [1, 2, 3, np.nan], dtype=CategoricalDtype(Index([1, 2, 3], dtype=any_numeric_ea_dtype)), ) tm.assert_series_equal(srs, expected) # set into srs.loc[1] = np.nan expected = Series( [1, np.nan, 3, np.nan], dtype=CategoricalDtype(Index([1, 2, 3], dtype=any_numeric_ea_dtype)), ) tm.assert_series_equal(srs, expected) @pytest.mark.parametrize("na", (np.nan, pd.NA, None, pd.NaT)) def test_loc_consistency_series_enlarge_set_into(self, na): # GH#47677 srs_enlarge = Series(["a", "b", "c"], dtype="category") srs_enlarge.loc[3] = na srs_setinto = Series(["a", "b", "c", "a"], dtype="category") srs_setinto.loc[3] = na tm.assert_series_equal(srs_enlarge, srs_setinto) expected = Series(["a", "b", "c", na], dtype="category") tm.assert_series_equal(srs_enlarge, expected) def test_loc_getitem_preserves_index_level_category_dtype(self): # GH#15166 df = DataFrame( data=np.arange(2, 22, 2), index=MultiIndex( levels=[CategoricalIndex(["a", "b"]), range(10)], codes=[[0] * 5 + [1] * 5, range(10)], names=["Index1", "Index2"], ), ) expected = CategoricalIndex( ["a", "b"], categories=["a", "b"], ordered=False, name="Index1", dtype="category", ) result = df.index.levels[0] tm.assert_index_equal(result, expected) result = df.loc[["a"]].index.levels[0] tm.assert_index_equal(result, expected) @pytest.mark.parametrize("lt_value", [30, 10]) def test_loc_multiindex_levels_contain_values_not_in_index_anymore(self, lt_value): # GH#41170 df = DataFrame({"a": [12, 23, 34, 45]}, index=[list("aabb"), [0, 1, 2, 3]]) with pytest.raises(KeyError, match=r"\['b'\] not in index"): df.loc[df["a"] < lt_value, :].loc[["b"], :] def test_loc_multiindex_null_slice_na_level(self): # GH#42055 lev1 = np.array([np.nan, np.nan]) lev2 = ["bar", "baz"] mi = MultiIndex.from_arrays([lev1, lev2]) ser = Series([0, 1], index=mi) result = ser.loc[:, "bar"] # TODO: should we have name="bar"? expected = Series([0], index=[np.nan]) tm.assert_series_equal(result, expected) def test_loc_drops_level(self): # Based on test_series_varied_multiindex_alignment, where # this used to fail to drop the first level mi = MultiIndex.from_product( [list("ab"), list("xy"), [1, 2]], names=["ab", "xy", "num"] ) ser = Series(range(8), index=mi) loc_result = ser.loc["a", :, :] expected = ser.index.droplevel(0)[:4] tm.assert_index_equal(loc_result.index, expected) class TestLocSetitemWithExpansion: @pytest.mark.slow def test_loc_setitem_with_expansion_large_dataframe(self): # GH#10692 result = DataFrame({"x": range(10**6)}, dtype="int64") result.loc[len(result)] = len(result) + 1 expected = DataFrame({"x": range(10**6 + 1)}, dtype="int64") tm.assert_frame_equal(result, expected) def test_loc_setitem_empty_series(self): # GH#5226 # partially set with an empty object series ser = Series(dtype=object) ser.loc[1] = 1 tm.assert_series_equal(ser, Series([1], index=[1])) ser.loc[3] = 3 tm.assert_series_equal(ser, Series([1, 3], index=[1, 3])) def test_loc_setitem_empty_series_float(self): # GH#5226 # partially set with an empty object series ser = Series(dtype=object) ser.loc[1] = 1.0 tm.assert_series_equal(ser, Series([1.0], index=[1])) ser.loc[3] = 3.0 tm.assert_series_equal(ser, Series([1.0, 3.0], index=[1, 3])) def test_loc_setitem_empty_series_str_idx(self): # GH#5226 # partially set with an empty object series ser = Series(dtype=object) ser.loc["foo"] = 1 tm.assert_series_equal(ser, Series([1], index=["foo"])) ser.loc["bar"] = 3 tm.assert_series_equal(ser, Series([1, 3], index=["foo", "bar"])) ser.loc[3] = 4 tm.assert_series_equal(ser, Series([1, 3, 4], index=["foo", "bar", 3])) def test_loc_setitem_incremental_with_dst(self): # GH#20724 base = datetime(2015, 11, 1, tzinfo=gettz("US/Pacific")) idxs = [base + timedelta(seconds=i * 900) for i in range(16)] result = Series([0], index=[idxs[0]]) for ts in idxs: result.loc[ts] = 1 expected = Series(1, index=idxs) tm.assert_series_equal(result, expected) @pytest.mark.parametrize( "conv", [ lambda x: x, lambda x: x.to_datetime64(), lambda x: x.to_pydatetime(), lambda x: np.datetime64(x), ], ids=["self", "to_datetime64", "to_pydatetime", "np.datetime64"], ) def test_loc_setitem_datetime_keys_cast(self, conv): # GH#9516 dt1 = Timestamp("20130101 09:00:00") dt2 = Timestamp("20130101 10:00:00") df = DataFrame() df.loc[conv(dt1), "one"] = 100 df.loc[conv(dt2), "one"] = 200 expected = DataFrame({"one": [100.0, 200.0]}, index=[dt1, dt2]) tm.assert_frame_equal(df, expected) def test_loc_setitem_categorical_column_retains_dtype(self, ordered): # GH16360 result = DataFrame({"A": [1]}) result.loc[:, "B"] = Categorical(["b"], ordered=ordered) expected = DataFrame({"A": [1], "B": Categorical(["b"], ordered=ordered)}) tm.assert_frame_equal(result, expected) def test_loc_setitem_with_expansion_and_existing_dst(self): # GH#18308 start = Timestamp("2017-10-29 00:00:00+0200", tz="Europe/Madrid") end = Timestamp("2017-10-29 03:00:00+0100", tz="Europe/Madrid") ts = Timestamp("2016-10-10 03:00:00", tz="Europe/Madrid") idx = date_range(start, end, inclusive="left", freq="H") assert ts not in idx # i.e. result.loc setitem is with-expansion result = DataFrame(index=idx, columns=["value"]) result.loc[ts, "value"] = 12 expected = DataFrame( [np.nan] * len(idx) + [12], index=idx.append(DatetimeIndex([ts])), columns=["value"], dtype=object, ) tm.assert_frame_equal(result, expected) def test_setitem_with_expansion(self): # indexing - setting an element df = DataFrame( data=to_datetime(["2015-03-30 20:12:32", "2015-03-12 00:11:11"]), columns=["time"], ) df["new_col"] = ["new", "old"] df.time = df.set_index("time").index.tz_localize("UTC") v = df[df.new_col == "new"].set_index("time").index.tz_convert("US/Pacific") # trying to set a single element on a part of a different timezone # this converts to object df2 = df.copy() with tm.assert_produces_warning(FutureWarning, match="mismatched timezone"): df2.loc[df2.new_col == "new", "time"] = v expected = Series([v[0], df.loc[1, "time"]], name="time") tm.assert_series_equal(df2.time, expected) v = df.loc[df.new_col == "new", "time"] + Timedelta("1s") df.loc[df.new_col == "new", "time"] = v tm.assert_series_equal(df.loc[df.new_col == "new", "time"], v) def test_loc_setitem_with_expansion_inf_upcast_empty(self): # Test with np.inf in columns df = DataFrame() df.loc[0, 0] = 1 df.loc[1, 1] = 2 df.loc[0, np.inf] = 3 result = df.columns expected = Float64Index([0, 1, np.inf]) tm.assert_index_equal(result, expected) @pytest.mark.filterwarnings("ignore:indexing past lexsort depth") def test_loc_setitem_with_expansion_nonunique_index(self, index): # GH#40096 if not len(index): return index = index.repeat(2) # ensure non-unique N = len(index) arr = np.arange(N).astype(np.int64) orig = DataFrame(arr, index=index, columns=[0]) # key that will requiring object-dtype casting in the index key = "kapow" assert key not in index # otherwise test is invalid # TODO: using a tuple key breaks here in many cases exp_index = index.insert(len(index), key) if isinstance(index, MultiIndex): assert exp_index[-1][0] == key else: assert exp_index[-1] == key exp_data = np.arange(N + 1).astype(np.float64) expected = DataFrame(exp_data, index=exp_index, columns=[0]) # Add new row, but no new columns df = orig.copy() df.loc[key, 0] = N tm.assert_frame_equal(df, expected) # add new row on a Series ser = orig.copy()[0] ser.loc[key] = N # the series machinery lets us preserve int dtype instead of float expected = expected[0].astype(np.int64) tm.assert_series_equal(ser, expected) # add new row and new column df = orig.copy() df.loc[key, 1] = N expected = DataFrame( {0: list(arr) + [np.nan], 1: [np.nan] * N + [float(N)]}, index=exp_index, ) tm.assert_frame_equal(df, expected) @pytest.mark.parametrize( "dtype", ["Int32", "Int64", "UInt32", "UInt64", "Float32", "Float64"] ) def test_loc_setitem_with_expansion_preserves_nullable_int(self, dtype): # GH#42099 ser = Series([0, 1, 2, 3], dtype=dtype) df = DataFrame({"data": ser}) result = DataFrame(index=df.index) result.loc[df.index, "data"] = ser tm.assert_frame_equal(result, df) result = DataFrame(index=df.index) result.loc[df.index, "data"] = ser._values tm.assert_frame_equal(result, df) class TestLocCallable: def test_frame_loc_getitem_callable(self): # GH#11485 df = DataFrame({"A": [1, 2, 3, 4], "B": list("aabb"), "C": [1, 2, 3, 4]}) # iloc cannot use boolean Series (see GH3635) # return bool indexer res = df.loc[lambda x: x.A > 2] tm.assert_frame_equal(res, df.loc[df.A > 2]) res = df.loc[lambda x: x.B == "b", :] tm.assert_frame_equal(res, df.loc[df.B == "b", :]) res = df.loc[lambda x: x.A > 2, lambda x: x.columns == "B"] tm.assert_frame_equal(res, df.loc[df.A > 2, [False, True, False]]) res = df.loc[lambda x: x.A > 2, lambda x: "B"] tm.assert_series_equal(res, df.loc[df.A > 2, "B"]) res = df.loc[lambda x: x.A > 2, lambda x: ["A", "B"]] tm.assert_frame_equal(res, df.loc[df.A > 2, ["A", "B"]]) res = df.loc[lambda x: x.A == 2, lambda x: ["A", "B"]] tm.assert_frame_equal(res, df.loc[df.A == 2, ["A", "B"]]) # scalar res = df.loc[lambda x: 1, lambda x: "A"] assert res == df.loc[1, "A"] def test_frame_loc_getitem_callable_mixture(self): # GH#11485 df = DataFrame({"A": [1, 2, 3, 4], "B": list("aabb"), "C": [1, 2, 3, 4]}) res = df.loc[lambda x: x.A > 2, ["A", "B"]] tm.assert_frame_equal(res, df.loc[df.A > 2, ["A", "B"]]) res = df.loc[[2, 3], lambda x: ["A", "B"]] tm.assert_frame_equal(res, df.loc[[2, 3], ["A", "B"]]) res = df.loc[3, lambda x: ["A", "B"]] tm.assert_series_equal(res, df.loc[3, ["A", "B"]]) def test_frame_loc_getitem_callable_labels(self): # GH#11485 df = DataFrame({"X": [1, 2, 3, 4], "Y": list("aabb")}, index=list("ABCD")) # return label res = df.loc[lambda x: ["A", "C"]] tm.assert_frame_equal(res, df.loc[["A", "C"]]) res = df.loc[lambda x: ["A", "C"], :] tm.assert_frame_equal(res, df.loc[["A", "C"], :]) res = df.loc[lambda x: ["A", "C"], lambda x: "X"] tm.assert_series_equal(res, df.loc[["A", "C"], "X"]) res = df.loc[lambda x: ["A", "C"], lambda x: ["X"]] tm.assert_frame_equal(res, df.loc[["A", "C"], ["X"]]) # mixture res = df.loc[["A", "C"], lambda x: "X"] tm.assert_series_equal(res, df.loc[["A", "C"], "X"]) res = df.loc[["A", "C"], lambda x: ["X"]] tm.assert_frame_equal(res, df.loc[["A", "C"], ["X"]]) res = df.loc[lambda x: ["A", "C"], "X"] tm.assert_series_equal(res, df.loc[["A", "C"], "X"]) res = df.loc[lambda x: ["A", "C"], ["X"]] tm.assert_frame_equal(res, df.loc[["A", "C"], ["X"]]) def test_frame_loc_setitem_callable(self): # GH#11485 df = DataFrame({"X": [1, 2, 3, 4], "Y": list("aabb")}, index=list("ABCD")) # return label res = df.copy() res.loc[lambda x: ["A", "C"]] = -20 exp = df.copy() exp.loc[["A", "C"]] = -20 tm.assert_frame_equal(res, exp) res = df.copy() res.loc[lambda x: ["A", "C"], :] = 20 exp = df.copy() exp.loc[["A", "C"], :] = 20 tm.assert_frame_equal(res, exp) res = df.copy() res.loc[lambda x: ["A", "C"], lambda x: "X"] = -1 exp = df.copy() exp.loc[["A", "C"], "X"] = -1 tm.assert_frame_equal(res, exp) res = df.copy() res.loc[lambda x: ["A", "C"], lambda x: ["X"]] = [5, 10] exp = df.copy() exp.loc[["A", "C"], ["X"]] = [5, 10] tm.assert_frame_equal(res, exp) # mixture res = df.copy() res.loc[["A", "C"], lambda x: "X"] = np.array([-1, -2]) exp = df.copy() exp.loc[["A", "C"], "X"] = np.array([-1, -2]) tm.assert_frame_equal(res, exp) res = df.copy() res.loc[["A", "C"], lambda x: ["X"]] = 10 exp = df.copy() exp.loc[["A", "C"], ["X"]] = 10 tm.assert_frame_equal(res, exp) res = df.copy() res.loc[lambda x: ["A", "C"], "X"] = -2 exp = df.copy() exp.loc[["A", "C"], "X"] = -2 tm.assert_frame_equal(res, exp) res = df.copy() res.loc[lambda x: ["A", "C"], ["X"]] = -4 exp = df.copy() exp.loc[["A", "C"], ["X"]] = -4 tm.assert_frame_equal(res, exp) class TestPartialStringSlicing: def test_loc_getitem_partial_string_slicing_datetimeindex(self): # GH#35509 df = DataFrame( {"col1": ["a", "b", "c"], "col2": [1, 2, 3]}, index=to_datetime(["2020-08-01", "2020-07-02", "2020-08-05"]), ) expected = DataFrame( {"col1": ["a", "c"], "col2": [1, 3]}, index=to_datetime(["2020-08-01", "2020-08-05"]), ) result = df.loc["2020-08"] tm.assert_frame_equal(result, expected) def test_loc_getitem_partial_string_slicing_with_periodindex(self): pi = pd.period_range(start="2017-01-01", end="2018-01-01", freq="M") ser = pi.to_series() result = ser.loc[:"2017-12"] expected = ser.iloc[:-1] tm.assert_series_equal(result, expected) def test_loc_getitem_partial_string_slicing_with_timedeltaindex(self): ix = timedelta_range(start="1 day", end="2 days", freq="1H") ser = ix.to_series() result = ser.loc[:"1 days"] expected = ser.iloc[:-1] tm.assert_series_equal(result, expected) def test_loc_getitem_str_timedeltaindex(self): # GH#16896 df = DataFrame({"x": range(3)}, index=to_timedelta(range(3), unit="days")) expected = df.iloc[0] sliced = df.loc["0 days"] tm.assert_series_equal(sliced, expected) @pytest.mark.parametrize("indexer_end", [None, "2020-01-02 23:59:59.999999999"]) def test_loc_getitem_partial_slice_non_monotonicity( self, tz_aware_fixture, indexer_end, frame_or_series ): # GH#33146 obj = frame_or_series( [1] * 5, index=DatetimeIndex( [ Timestamp("2019-12-30"), Timestamp("2020-01-01"), Timestamp("2019-12-25"), Timestamp("2020-01-02 23:59:59.999999999"), Timestamp("2019-12-19"), ], tz=tz_aware_fixture, ), ) expected = frame_or_series( [1] * 2, index=DatetimeIndex( [ Timestamp("2020-01-01"), Timestamp("2020-01-02 23:59:59.999999999"), ], tz=tz_aware_fixture, ), ) indexer = slice("2020-01-01", indexer_end) result = obj[indexer] tm.assert_equal(result, expected) result = obj.loc[indexer] tm.assert_equal(result, expected) class TestLabelSlicing: def test_loc_getitem_slicing_datetimes_frame(self): # GH#7523 # unique df_unique = DataFrame( np.arange(4.0, dtype="float64"), index=[datetime(2001, 1, i, 10, 00) for i in [1, 2, 3, 4]], ) # duplicates df_dups = DataFrame( np.arange(5.0, dtype="float64"), index=[datetime(2001, 1, i, 10, 00) for i in [1, 2, 2, 3, 4]], ) for df in [df_unique, df_dups]: result = df.loc[datetime(2001, 1, 1, 10) :] tm.assert_frame_equal(result, df) result = df.loc[: datetime(2001, 1, 4, 10)] tm.assert_frame_equal(result, df) result = df.loc[datetime(2001, 1, 1, 10) : datetime(2001, 1, 4, 10)] tm.assert_frame_equal(result, df) result = df.loc[datetime(2001, 1, 1, 11) :] expected = df.iloc[1:] tm.assert_frame_equal(result, expected) result = df.loc["20010101 11":] tm.assert_frame_equal(result, expected) def test_loc_getitem_label_slice_across_dst(self): # GH#21846 idx = date_range( "2017-10-29 01:30:00", tz="Europe/Berlin", periods=5, freq="30 min" ) series2 = Series([0, 1, 2, 3, 4], index=idx) t_1 = Timestamp("2017-10-29 02:30:00+02:00", tz="Europe/Berlin") t_2 = Timestamp("2017-10-29 02:00:00+01:00", tz="Europe/Berlin") result = series2.loc[t_1:t_2] expected = Series([2, 3], index=idx[2:4]) tm.assert_series_equal(result, expected) result = series2[t_1] expected = 2 assert result == expected @pytest.mark.parametrize( "index", [ pd.period_range(start="2017-01-01", end="2018-01-01", freq="M"), timedelta_range(start="1 day", end="2 days", freq="1H"), ], ) def test_loc_getitem_label_slice_period_timedelta(self, index): ser = index.to_series() result = ser.loc[: index[-2]] expected = ser.iloc[:-1] tm.assert_series_equal(result, expected) def test_loc_getitem_slice_floats_inexact(self): index = [52195.504153, 52196.303147, 52198.369883] df = DataFrame(np.random.rand(3, 2), index=index) s1 = df.loc[52195.1:52196.5] assert len(s1) == 2 s1 = df.loc[52195.1:52196.6] assert len(s1) == 2 s1 = df.loc[52195.1:52198.9] assert len(s1) == 3 def test_loc_getitem_float_slice_float64index(self): ser = Series(np.random.rand(10), index=np.arange(10, 20, dtype=float)) assert len(ser.loc[12.0:]) == 8 assert len(ser.loc[12.5:]) == 7 idx = np.arange(10, 20, dtype=float) idx[2] = 12.2 ser.index = idx assert len(ser.loc[12.0:]) == 8 assert len(ser.loc[12.5:]) == 7 @pytest.mark.parametrize( "start,stop, expected_slice", [ [np.timedelta64(0, "ns"), None, slice(0, 11)], [np.timedelta64(1, "D"), np.timedelta64(6, "D"), slice(1, 7)], [None, np.timedelta64(4, "D"), slice(0, 5)], ], ) def test_loc_getitem_slice_label_td64obj(self, start, stop, expected_slice): # GH#20393 ser = Series(range(11), timedelta_range("0 days", "10 days")) result = ser.loc[slice(start, stop)] expected = ser.iloc[expected_slice] tm.assert_series_equal(result, expected) @pytest.mark.parametrize("start", ["2018", "2020"]) def test_loc_getitem_slice_unordered_dt_index(self, frame_or_series, start): obj = frame_or_series( [1, 2, 3], index=[Timestamp("2016"), Timestamp("2019"), Timestamp("2017")], ) with tm.assert_produces_warning(FutureWarning): obj.loc[start:"2022"] @pytest.mark.parametrize("value", [1, 1.5]) def test_loc_getitem_slice_labels_int_in_object_index(self, frame_or_series, value): # GH: 26491 obj = frame_or_series(range(4), index=[value, "first", 2, "third"]) result = obj.loc[value:"third"] expected = frame_or_series(range(4), index=[value, "first", 2, "third"]) tm.assert_equal(result, expected) def test_loc_getitem_slice_columns_mixed_dtype(self): # GH: 20975 df = DataFrame({"test": 1, 1: 2, 2: 3}, index=[0]) expected = DataFrame( data=[[2, 3]], index=[0], columns=Index([1, 2], dtype=object) ) tm.assert_frame_equal(df.loc[:, 1:], expected) class TestLocBooleanLabelsAndSlices(Base): @pytest.mark.parametrize("bool_value", [True, False]) def test_loc_bool_incompatible_index_raises( self, index, frame_or_series, bool_value ): # GH20432 message = f"{bool_value}: boolean label can not be used without a boolean index" if index.inferred_type != "boolean": obj = frame_or_series(index=index, dtype="object") with pytest.raises(KeyError, match=message): obj.loc[bool_value] @pytest.mark.parametrize("bool_value", [True, False]) def test_loc_bool_should_not_raise(self, frame_or_series, bool_value): obj = frame_or_series( index=Index([True, False], dtype="boolean"), dtype="object" ) obj.loc[bool_value] def test_loc_bool_slice_raises(self, index, frame_or_series): # GH20432 message = ( r"slice\(True, False, None\): boolean values can not be used in a slice" ) obj = frame_or_series(index=index, dtype="object") with pytest.raises(TypeError, match=message): obj.loc[True:False] class TestLocBooleanMask: def test_loc_setitem_bool_mask_timedeltaindex(self): # GH#14946 df = DataFrame({"x": range(10)}) df.index = to_timedelta(range(10), unit="s") conditions = [df["x"] > 3, df["x"] == 3, df["x"] < 3] expected_data = [ [0, 1, 2, 3, 10, 10, 10, 10, 10, 10], [0, 1, 2, 10, 4, 5, 6, 7, 8, 9], [10, 10, 10, 3, 4, 5, 6, 7, 8, 9], ] for cond, data in zip(conditions, expected_data): result = df.copy() result.loc[cond, "x"] = 10 expected = DataFrame( data, index=to_timedelta(range(10), unit="s"), columns=["x"], dtype="int64", ) tm.assert_frame_equal(expected, result) @pytest.mark.parametrize("tz", [None, "UTC"]) def test_loc_setitem_mask_with_datetimeindex_tz(self, tz): # GH#16889 # support .loc with alignment and tz-aware DatetimeIndex mask = np.array([True, False, True, False]) idx = date_range("20010101", periods=4, tz=tz) df = DataFrame({"a": np.arange(4)}, index=idx).astype("float64") result = df.copy() result.loc[mask, :] = df.loc[mask, :] tm.assert_frame_equal(result, df) result = df.copy() result.loc[mask] = df.loc[mask] tm.assert_frame_equal(result, df) def test_loc_setitem_mask_and_label_with_datetimeindex(self): # GH#9478 # a datetimeindex alignment issue with partial setting df = DataFrame( np.arange(6.0).reshape(3, 2), columns=list("AB"), index=date_range("1/1/2000", periods=3, freq="1H"), ) expected = df.copy() expected["C"] = [expected.index[0]] + [pd.NaT, pd.NaT] mask = df.A < 1 df.loc[mask, "C"] = df.loc[mask].index tm.assert_frame_equal(df, expected) def test_loc_setitem_mask_td64_series_value(self): # GH#23462 key list of bools, value is a Series td1 = Timedelta(0) td2 = Timedelta(28767471428571405) df = DataFrame({"col": Series([td1, td2])}) df_copy = df.copy() ser = Series([td1]) expected = df["col"].iloc[1].value df.loc[[True, False]] = ser result = df["col"].iloc[1].value assert expected == result tm.assert_frame_equal(df, df_copy) @td.skip_array_manager_invalid_test # TODO(ArrayManager) rewrite not using .values def test_loc_setitem_boolean_and_column(self, float_frame): expected = float_frame.copy() mask = float_frame["A"] > 0 float_frame.loc[mask, "B"] = 0 expected.values[mask.values, 1] = 0 tm.assert_frame_equal(float_frame, expected) def test_loc_setitem_ndframe_values_alignment(self, using_copy_on_write): # GH#45501 df = DataFrame({"a": [1, 2, 3], "b": [4, 5, 6]}) df.loc[[False, False, True], ["a"]] = DataFrame( {"a": [10, 20, 30]}, index=[2, 1, 0] ) expected = DataFrame({"a": [1, 2, 10], "b": [4, 5, 6]}) tm.assert_frame_equal(df, expected) # same thing with Series RHS df = DataFrame({"a": [1, 2, 3], "b": [4, 5, 6]}) df.loc[[False, False, True], ["a"]] = Series([10, 11, 12], index=[2, 1, 0]) tm.assert_frame_equal(df, expected) # same thing but setting "a" instead of ["a"] df = DataFrame({"a": [1, 2, 3], "b": [4, 5, 6]}) df.loc[[False, False, True], "a"] = Series([10, 11, 12], index=[2, 1, 0]) tm.assert_frame_equal(df, expected) df = DataFrame({"a": [1, 2, 3], "b": [4, 5, 6]}) df_orig = df.copy() ser = df["a"] ser.loc[[False, False, True]] = Series([10, 11, 12], index=[2, 1, 0]) if using_copy_on_write: tm.assert_frame_equal(df, df_orig) else: tm.assert_frame_equal(df, expected) class TestLocListlike: @pytest.mark.parametrize("box", [lambda x: x, np.asarray, list]) def test_loc_getitem_list_of_labels_categoricalindex_with_na(self, box): # passing a list can include valid categories _or_ NA values ci = CategoricalIndex(["A", "B", np.nan]) ser = Series(range(3), index=ci) result = ser.loc[box(ci)] tm.assert_series_equal(result, ser) result = ser[box(ci)] tm.assert_series_equal(result, ser) result = ser.to_frame().loc[box(ci)] tm.assert_frame_equal(result, ser.to_frame()) ser2 = ser[:-1] ci2 = ci[1:] # but if there are no NAs present, this should raise KeyError msg = "not in index" with pytest.raises(KeyError, match=msg): ser2.loc[box(ci2)] with pytest.raises(KeyError, match=msg): ser2[box(ci2)] with pytest.raises(KeyError, match=msg): ser2.to_frame().loc[box(ci2)] def test_loc_getitem_series_label_list_missing_values(self): # gh-11428 key = np.array( ["2001-01-04", "2001-01-02", "2001-01-04", "2001-01-14"], dtype="datetime64" ) ser = Series([2, 5, 8, 11], date_range("2001-01-01", freq="D", periods=4)) with pytest.raises(KeyError, match="not in index"): ser.loc[key] def test_loc_getitem_series_label_list_missing_integer_values(self): # GH: 25927 ser = Series( index=np.array([9730701000001104, 10049011000001109]), data=np.array([999000011000001104, 999000011000001104]), ) with pytest.raises(KeyError, match="not in index"): ser.loc[np.array([9730701000001104, 10047311000001102])] @pytest.mark.parametrize("to_period", [True, False]) def test_loc_getitem_listlike_of_datetimelike_keys(self, to_period): # GH#11497 idx = date_range("2011-01-01", "2011-01-02", freq="D", name="idx") if to_period: idx = idx.to_period("D") ser = Series([0.1, 0.2], index=idx, name="s") keys = [Timestamp("2011-01-01"), Timestamp("2011-01-02")] if to_period: keys = [x.to_period("D") for x in keys] result = ser.loc[keys] exp = Series([0.1, 0.2], index=idx, name="s") if not to_period: exp.index = exp.index._with_freq(None) tm.assert_series_equal(result, exp, check_index_type=True) keys = [ Timestamp("2011-01-02"), Timestamp("2011-01-02"), Timestamp("2011-01-01"), ] if to_period: keys = [x.to_period("D") for x in keys] exp = Series( [0.2, 0.2, 0.1], index=Index(keys, name="idx", dtype=idx.dtype), name="s" ) result = ser.loc[keys] tm.assert_series_equal(result, exp, check_index_type=True) keys = [ Timestamp("2011-01-03"), Timestamp("2011-01-02"), Timestamp("2011-01-03"), ] if to_period: keys = [x.to_period("D") for x in keys] with pytest.raises(KeyError, match="not in index"): ser.loc[keys] def test_loc_named_index(self): # GH 42790 df = DataFrame( [[1, 2], [4, 5], [7, 8]], index=["cobra", "viper", "sidewinder"], columns=["max_speed", "shield"], ) expected = df.iloc[:2] expected.index.name = "foo" result = df.loc[Index(["cobra", "viper"], name="foo")] tm.assert_frame_equal(result, expected) @pytest.mark.parametrize( "columns, column_key, expected_columns", [ ([2011, 2012, 2013], [2011, 2012], [0, 1]), ([2011, 2012, "All"], [2011, 2012], [0, 1]), ([2011, 2012, "All"], [2011, "All"], [0, 2]), ], ) def test_loc_getitem_label_list_integer_labels(columns, column_key, expected_columns): # gh-14836 df = DataFrame(np.random.rand(3, 3), columns=columns, index=list("ABC")) expected = df.iloc[:, expected_columns] result = df.loc[["A", "B", "C"], column_key] tm.assert_frame_equal(result, expected, check_column_type=True) def test_loc_setitem_float_intindex(): # GH 8720 rand_data = np.random.randn(8, 4) result = DataFrame(rand_data) result.loc[:, 0.5] = np.nan expected_data = np.hstack((rand_data, np.array([np.nan] * 8).reshape(8, 1))) expected = DataFrame(expected_data, columns=[0.0, 1.0, 2.0, 3.0, 0.5]) tm.assert_frame_equal(result, expected) result = DataFrame(rand_data) result.loc[:, 0.5] = np.nan tm.assert_frame_equal(result, expected) def test_loc_axis_1_slice(): # GH 10586 cols = [(yr, m) for yr in [2014, 2015] for m in [7, 8, 9, 10]] df = DataFrame( np.ones((10, 8)), index=tuple("ABCDEFGHIJ"), columns=MultiIndex.from_tuples(cols), ) result = df.loc(axis=1)[(2014, 9):(2015, 8)] expected = DataFrame( np.ones((10, 4)), index=tuple("ABCDEFGHIJ"), columns=MultiIndex.from_tuples([(2014, 9), (2014, 10), (2015, 7), (2015, 8)]), ) tm.assert_frame_equal(result, expected) def test_loc_set_dataframe_multiindex(): # GH 14592 expected = DataFrame( "a", index=range(2), columns=MultiIndex.from_product([range(2), range(2)]) ) result = expected.copy() result.loc[0, [(0, 1)]] = result.loc[0, [(0, 1)]] tm.assert_frame_equal(result, expected) def test_loc_mixed_int_float(): # GH#19456 ser = Series(range(2), Index([1, 2.0], dtype=object)) result = ser.loc[1] assert result == 0 def test_loc_with_positional_slice_deprecation(): # GH#31840 ser = Series(range(4), index=["A", "B", "C", "D"]) with tm.assert_produces_warning(FutureWarning): ser.loc[:3] = 2 expected = Series([2, 2, 2, 3], index=["A", "B", "C", "D"]) tm.assert_series_equal(ser, expected) def test_loc_slice_disallows_positional(): # GH#16121, GH#24612, GH#31810 dti = date_range("2016-01-01", periods=3) df = DataFrame(np.random.random((3, 2)), index=dti) ser = df[0] msg = ( "cannot do slice indexing on DatetimeIndex with these " r"indexers \[1\] of type int" ) for obj in [df, ser]: with pytest.raises(TypeError, match=msg): obj.loc[1:3] with tm.assert_produces_warning(FutureWarning): # GH#31840 deprecated incorrect behavior obj.loc[1:3] = 1 with pytest.raises(TypeError, match=msg): df.loc[1:3, 1] with tm.assert_produces_warning(FutureWarning): # GH#31840 deprecated incorrect behavior df.loc[1:3, 1] = 2 def test_loc_datetimelike_mismatched_dtypes(): # GH#32650 dont mix and match datetime/timedelta/period dtypes df = DataFrame( np.random.randn(5, 3), columns=["a", "b", "c"], index=date_range("2012", freq="H", periods=5), ) # create dataframe with non-unique DatetimeIndex df = df.iloc[[0, 2, 2, 3]].copy() dti = df.index tdi = pd.TimedeltaIndex(dti.asi8) # matching i8 values msg = r"None of \[TimedeltaIndex.* are in the \[index\]" with pytest.raises(KeyError, match=msg): df.loc[tdi] with pytest.raises(KeyError, match=msg): df["a"].loc[tdi] def test_loc_with_period_index_indexer(): # GH#4125 idx = pd.period_range("2002-01", "2003-12", freq="M") df = DataFrame(np.random.randn(24, 10), index=idx) tm.assert_frame_equal(df, df.loc[idx]) tm.assert_frame_equal(df, df.loc[list(idx)]) tm.assert_frame_equal(df, df.loc[list(idx)]) tm.assert_frame_equal(df.iloc[0:5], df.loc[idx[0:5]]) tm.assert_frame_equal(df, df.loc[list(idx)]) def test_loc_setitem_multiindex_timestamp(): # GH#13831 vals = np.random.randn(8, 6) idx = date_range("1/1/2000", periods=8) cols = ["A", "B", "C", "D", "E", "F"] exp = DataFrame(vals, index=idx, columns=cols) exp.loc[exp.index[1], ("A", "B")] = np.nan vals[1][0:2] = np.nan res = DataFrame(vals, index=idx, columns=cols) tm.assert_frame_equal(res, exp) def test_loc_getitem_multiindex_tuple_level(): # GH#27591 lev1 = ["a", "b", "c"] lev2 = [(0, 1), (1, 0)] lev3 = [0, 1] cols = MultiIndex.from_product([lev1, lev2, lev3], names=["x", "y", "z"]) df = DataFrame(6, index=range(5), columns=cols) # the lev2[0] here should be treated as a single label, not as a sequence # of labels result = df.loc[:, (lev1[0], lev2[0], lev3[0])] # TODO: i think this actually should drop levels expected = df.iloc[:, :1] tm.assert_frame_equal(result, expected) alt = df.xs((lev1[0], lev2[0], lev3[0]), level=[0, 1, 2], axis=1) tm.assert_frame_equal(alt, expected) # same thing on a Series ser = df.iloc[0] expected2 = ser.iloc[:1] alt2 = ser.xs((lev1[0], lev2[0], lev3[0]), level=[0, 1, 2], axis=0) tm.assert_series_equal(alt2, expected2) result2 = ser.loc[lev1[0], lev2[0], lev3[0]] assert result2 == 6 def test_loc_getitem_nullable_index_with_duplicates(): # GH#34497 df = DataFrame( data=np.array([[1, 2, 3, 4], [5, 6, 7, 8], [1, 2, np.nan, np.nan]]).T, columns=["a", "b", "c"], dtype="Int64", ) df2 = df.set_index("c") assert df2.index.dtype == "Int64" res = df2.loc[1] expected = Series([1, 5], index=df2.columns, dtype="Int64", name=1) tm.assert_series_equal(res, expected) # pd.NA and duplicates in an object-dtype Index df2.index = df2.index.astype(object) res = df2.loc[1] tm.assert_series_equal(res, expected) @pytest.mark.parametrize("value", [300, np.uint16(300), np.int16(300)]) def test_loc_setitem_uint8_upcast(value): # GH#26049 df = DataFrame([1, 2, 3, 4], columns=["col1"], dtype="uint8") df.loc[2, "col1"] = value # value that can't be held in uint8 expected = DataFrame([1, 2, 300, 4], columns=["col1"], dtype="uint16") tm.assert_frame_equal(df, expected) @pytest.mark.parametrize( "fill_val,exp_dtype", [ (Timestamp("2022-01-06"), "datetime64[ns]"), (Timestamp("2022-01-07", tz="US/Eastern"), "datetime64[ns, US/Eastern]"), ], ) def test_loc_setitem_using_datetimelike_str_as_index(fill_val, exp_dtype): data = ["2022-01-02", "2022-01-03", "2022-01-04", fill_val.date()] index = DatetimeIndex(data, tz=fill_val.tz, dtype=exp_dtype) df = DataFrame([10, 11, 12, 14], columns=["a"], index=index) # adding new row using an unexisting datetime-like str index df.loc["2022-01-08", "a"] = 13 data.append("2022-01-08") expected_index = DatetimeIndex(data, dtype=exp_dtype) tm.assert_index_equal(df.index, expected_index, exact=True) def test_loc_set_int_dtype(): # GH#23326 df = DataFrame([list("abc")]) df.loc[:, "col1"] = 5 expected = DataFrame({0: ["a"], 1: ["b"], 2: ["c"], "col1": [5]}) tm.assert_frame_equal(df, expected) def test_loc_periodindex_3_levels(): # GH#24091 p_index = PeriodIndex( ["20181101 1100", "20181101 1200", "20181102 1300", "20181102 1400"], name="datetime", freq="B", ) mi_series = DataFrame( [["A", "B", 1.0], ["A", "C", 2.0], ["Z", "Q", 3.0], ["W", "F", 4.0]], index=p_index, columns=["ONE", "TWO", "VALUES"], ) mi_series = mi_series.set_index(["ONE", "TWO"], append=True)["VALUES"] assert mi_series.loc[(p_index[0], "A", "B")] == 1.0 class TestLocSeries: @pytest.mark.parametrize("val,expected", [(2**63 - 1, 3), (2**63, 4)]) def test_loc_uint64(self, val, expected): # see GH#19399 ser = Series({2**63 - 1: 3, 2**63: 4}) assert ser.loc[val] == expected def test_loc_getitem(self, string_series, datetime_series): inds = string_series.index[[3, 4, 7]] tm.assert_series_equal(string_series.loc[inds], string_series.reindex(inds)) tm.assert_series_equal(string_series.iloc[5::2], string_series[5::2]) # slice with indices d1, d2 = datetime_series.index[[5, 15]] result = datetime_series.loc[d1:d2] expected = datetime_series.truncate(d1, d2) tm.assert_series_equal(result, expected) # boolean mask = string_series > string_series.median() tm.assert_series_equal(string_series.loc[mask], string_series[mask]) # ask for index value assert datetime_series.loc[d1] == datetime_series[d1] assert datetime_series.loc[d2] == datetime_series[d2] def test_loc_getitem_not_monotonic(self, datetime_series): d1, d2 = datetime_series.index[[5, 15]] ts2 = datetime_series[::2][[1, 2, 0]] msg = r"Timestamp\('2000-01-10 00:00:00'\)" with pytest.raises(KeyError, match=msg): ts2.loc[d1:d2] with pytest.raises(KeyError, match=msg): ts2.loc[d1:d2] = 0 def test_loc_getitem_setitem_integer_slice_keyerrors(self): ser = Series(np.random.randn(10), index=list(range(0, 20, 2))) # this is OK cp = ser.copy() cp.iloc[4:10] = 0 assert (cp.iloc[4:10] == 0).all() # so is this cp = ser.copy() cp.iloc[3:11] = 0 assert (cp.iloc[3:11] == 0).values.all() result = ser.iloc[2:6] result2 = ser.loc[3:11] expected = ser.reindex([4, 6, 8, 10]) tm.assert_series_equal(result, expected) tm.assert_series_equal(result2, expected) # non-monotonic, raise KeyError s2 = ser.iloc[list(range(5)) + list(range(9, 4, -1))] with pytest.raises(KeyError, match=r"^3$"): s2.loc[3:11] with pytest.raises(KeyError, match=r"^3$"): s2.loc[3:11] = 0 def test_loc_getitem_iterator(self, string_series): idx = iter(string_series.index[:10]) result = string_series.loc[idx] tm.assert_series_equal(result, string_series[:10]) def test_loc_setitem_boolean(self, string_series): mask = string_series > string_series.median() result = string_series.copy() result.loc[mask] = 0 expected = string_series expected[mask] = 0 tm.assert_series_equal(result, expected) def test_loc_setitem_corner(self, string_series): inds = list(string_series.index[[5, 8, 12]]) string_series.loc[inds] = 5 msg = r"\['foo'\] not in index" with pytest.raises(KeyError, match=msg): string_series.loc[inds + ["foo"]] = 5 def test_basic_setitem_with_labels(self, datetime_series): indices = datetime_series.index[[5, 10, 15]] cp = datetime_series.copy() exp = datetime_series.copy() cp[indices] = 0 exp.loc[indices] = 0 tm.assert_series_equal(cp, exp) cp = datetime_series.copy() exp = datetime_series.copy() cp[indices[0] : indices[2]] = 0 exp.loc[indices[0] : indices[2]] = 0 tm.assert_series_equal(cp, exp) def test_loc_setitem_listlike_of_ints(self): # integer indexes, be careful ser = Series(np.random.randn(10), index=list(range(0, 20, 2))) inds = [0, 4, 6] arr_inds = np.array([0, 4, 6]) cp = ser.copy() exp = ser.copy() ser[inds] = 0 ser.loc[inds] = 0 tm.assert_series_equal(cp, exp) cp = ser.copy() exp = ser.copy() ser[arr_inds] = 0 ser.loc[arr_inds] = 0 tm.assert_series_equal(cp, exp) inds_notfound = [0, 4, 5, 6] arr_inds_notfound = np.array([0, 4, 5, 6]) msg = r"\[5\] not in index" with pytest.raises(KeyError, match=msg): ser[inds_notfound] = 0 with pytest.raises(Exception, match=msg): ser[arr_inds_notfound] = 0 def test_loc_setitem_dt64tz_values(self): # GH#12089 ser = Series( date_range("2011-01-01", periods=3, tz="US/Eastern"), index=["a", "b", "c"], ) s2 = ser.copy() expected = Timestamp("2011-01-03", tz="US/Eastern") s2.loc["a"] = expected result = s2.loc["a"] assert result == expected s2 = ser.copy() s2.iloc[0] = expected result = s2.iloc[0] assert result == expected s2 = ser.copy() s2["a"] = expected result = s2["a"] assert result == expected @pytest.mark.parametrize("array_fn", [np.array, pd.array, list, tuple]) @pytest.mark.parametrize("size", [0, 4, 5, 6]) def test_loc_iloc_setitem_with_listlike(self, size, array_fn): # GH37748 # testing insertion, in a Series of size N (here 5), of a listlike object # of size 0, N-1, N, N+1 arr = array_fn([0] * size) expected = Series([arr, 0, 0, 0, 0], index=list("abcde"), dtype=object) ser = Series(0, index=list("abcde"), dtype=object) ser.loc["a"] = arr tm.assert_series_equal(ser, expected) ser = Series(0, index=list("abcde"), dtype=object) ser.iloc[0] = arr tm.assert_series_equal(ser, expected) @pytest.mark.parametrize("indexer", [IndexSlice["A", :], ("A", slice(None))]) def test_loc_series_getitem_too_many_dimensions(self, indexer): # GH#35349 ser = Series( index=MultiIndex.from_tuples([("A", "0"), ("A", "1"), ("B", "0")]), data=[21, 22, 23], ) msg = "Too many indexers" with pytest.raises(IndexingError, match=msg): ser.loc[indexer, :] with pytest.raises(IndexingError, match=msg): ser.loc[indexer, :] = 1 def test_loc_setitem(self, string_series): inds = string_series.index[[3, 4, 7]] result = string_series.copy() result.loc[inds] = 5 expected = string_series.copy() expected[[3, 4, 7]] = 5 tm.assert_series_equal(result, expected) result.iloc[5:10] = 10 expected[5:10] = 10 tm.assert_series_equal(result, expected) # set slice with indices d1, d2 = string_series.index[[5, 15]] result.loc[d1:d2] = 6 expected[5:16] = 6 # because it's inclusive tm.assert_series_equal(result, expected) # set index value string_series.loc[d1] = 4 string_series.loc[d2] = 6 assert string_series[d1] == 4 assert string_series[d2] == 6 @pytest.mark.parametrize("dtype", ["object", "string"]) def test_loc_assign_dict_to_row(self, dtype): # GH41044 df = DataFrame({"A": ["abc", "def"], "B": ["ghi", "jkl"]}, dtype=dtype) df.loc[0, :] = {"A": "newA", "B": "newB"} expected = DataFrame({"A": ["newA", "def"], "B": ["newB", "jkl"]}, dtype=dtype) tm.assert_frame_equal(df, expected) @td.skip_array_manager_invalid_test def test_loc_setitem_dict_timedelta_multiple_set(self): # GH 16309 result = DataFrame(columns=["time", "value"]) result.loc[1] = {"time": Timedelta(6, unit="s"), "value": "foo"} result.loc[1] = {"time": Timedelta(6, unit="s"), "value": "foo"} expected = DataFrame( [[Timedelta(6, unit="s"), "foo"]], columns=["time", "value"], index=[1] ) tm.assert_frame_equal(result, expected) def test_loc_set_multiple_items_in_multiple_new_columns(self): # GH 25594 df = DataFrame(index=[1, 2], columns=["a"]) df.loc[1, ["b", "c"]] = [6, 7] expected = DataFrame( { "a": Series([np.nan, np.nan], dtype="object"), "b": [6, np.nan], "c": [7, np.nan], }, index=[1, 2], ) tm.assert_frame_equal(df, expected) def test_getitem_loc_str_periodindex(self): # GH#33964 index = pd.period_range(start="2000", periods=20, freq="B") series = Series(range(20), index=index) assert series.loc["2000-01-14"] == 9 def test_deprecation_warnings_raised_loc(self): # GH#48673 with tm.assert_produces_warning(DeprecationWarning): values = np.arange(4).reshape(2, 2) df = DataFrame(values, columns=["a", "b"]) new = np.array([10, 11]).astype(np.int16) df.loc[:, "a"] = new