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1049 lines
35 KiB
Python
1049 lines
35 KiB
Python
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""" test fancy indexing & misc """
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from datetime import datetime
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import re
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import weakref
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import numpy as np
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import pytest
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from pandas.core.dtypes.common import is_float_dtype, is_integer_dtype
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import pandas as pd
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from pandas import DataFrame, Index, NaT, Series
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import pandas._testing as tm
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from pandas.core.indexing import maybe_numeric_slice, non_reducing_slice
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from pandas.tests.indexing.common import _mklbl
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from .test_floats import gen_obj
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def getitem(x):
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return x
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def setitem(x):
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return x
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def loc(x):
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return x.loc
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def iloc(x):
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return x.iloc
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# ------------------------------------------------------------------------
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# Indexing test cases
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class TestFancy:
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""" pure get/set item & fancy indexing """
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def test_setitem_ndarray_1d(self):
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# GH5508
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# len of indexer vs length of the 1d ndarray
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df = DataFrame(index=Index(np.arange(1, 11)))
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df["foo"] = np.zeros(10, dtype=np.float64)
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df["bar"] = np.zeros(10, dtype=complex)
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# invalid
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msg = "Must have equal len keys and value when setting with an iterable"
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with pytest.raises(ValueError, match=msg):
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df.loc[df.index[2:5], "bar"] = np.array([2.33j, 1.23 + 0.1j, 2.2, 1.0])
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# valid
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df.loc[df.index[2:6], "bar"] = np.array([2.33j, 1.23 + 0.1j, 2.2, 1.0])
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result = df.loc[df.index[2:6], "bar"]
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expected = Series(
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[2.33j, 1.23 + 0.1j, 2.2, 1.0], index=[3, 4, 5, 6], name="bar"
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)
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tm.assert_series_equal(result, expected)
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# dtype getting changed?
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df = DataFrame(index=Index(np.arange(1, 11)))
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df["foo"] = np.zeros(10, dtype=np.float64)
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df["bar"] = np.zeros(10, dtype=complex)
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msg = "Must have equal len keys and value when setting with an iterable"
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with pytest.raises(ValueError, match=msg):
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df[2:5] = np.arange(1, 4) * 1j
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@pytest.mark.parametrize("idxr", [getitem, loc, iloc])
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def test_getitem_ndarray_3d(self, index, frame_or_series, idxr):
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# GH 25567
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obj = gen_obj(frame_or_series, index)
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idxr = idxr(obj)
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nd3 = np.random.randint(5, size=(2, 2, 2))
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msg = "|".join(
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[
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r"Buffer has wrong number of dimensions \(expected 1, got 3\)",
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"Cannot index with multidimensional key",
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r"Wrong number of dimensions. values.ndim != ndim \[3 != 1\]",
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"Index data must be 1-dimensional",
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"positional indexers are out-of-bounds",
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"Indexing a MultiIndex with a multidimensional key is not implemented",
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]
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)
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potential_errors = (IndexError, ValueError, NotImplementedError)
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with pytest.raises(potential_errors, match=msg):
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with tm.assert_produces_warning(DeprecationWarning, check_stacklevel=False):
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idxr[nd3]
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@pytest.mark.parametrize("indexer", [setitem, loc, iloc])
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def test_setitem_ndarray_3d(self, index, frame_or_series, indexer):
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# GH 25567
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obj = gen_obj(frame_or_series, index)
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idxr = indexer(obj)
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nd3 = np.random.randint(5, size=(2, 2, 2))
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if indexer.__name__ == "iloc":
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err = ValueError
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msg = f"Cannot set values with ndim > {obj.ndim}"
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elif (
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isinstance(index, pd.IntervalIndex)
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and indexer.__name__ == "setitem"
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and obj.ndim == 1
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):
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err = AttributeError
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msg = (
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"'pandas._libs.interval.IntervalTree' object has no attribute 'get_loc'"
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)
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else:
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err = ValueError
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msg = r"Buffer has wrong number of dimensions \(expected 1, got 3\)|"
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with pytest.raises(err, match=msg):
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idxr[nd3] = 0
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def test_inf_upcast(self):
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# GH 16957
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# We should be able to use np.inf as a key
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# np.inf should cause an index to convert to float
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# Test with np.inf in rows
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df = DataFrame(columns=[0])
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df.loc[1] = 1
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df.loc[2] = 2
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df.loc[np.inf] = 3
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# make sure we can look up the value
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assert df.loc[np.inf, 0] == 3
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result = df.index
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expected = pd.Float64Index([1, 2, np.inf])
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tm.assert_index_equal(result, expected)
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# Test with np.inf in columns
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df = DataFrame()
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df.loc[0, 0] = 1
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df.loc[1, 1] = 2
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df.loc[0, np.inf] = 3
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result = df.columns
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expected = pd.Float64Index([0, 1, np.inf])
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tm.assert_index_equal(result, expected)
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def test_setitem_dtype_upcast(self):
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# GH3216
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df = DataFrame([{"a": 1}, {"a": 3, "b": 2}])
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df["c"] = np.nan
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assert df["c"].dtype == np.float64
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df.loc[0, "c"] = "foo"
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expected = DataFrame(
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[{"a": 1, "b": np.nan, "c": "foo"}, {"a": 3, "b": 2, "c": np.nan}]
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)
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tm.assert_frame_equal(df, expected)
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# GH10280
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df = DataFrame(
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np.arange(6, dtype="int64").reshape(2, 3),
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index=list("ab"),
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columns=["foo", "bar", "baz"],
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)
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for val in [3.14, "wxyz"]:
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left = df.copy()
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left.loc["a", "bar"] = val
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right = DataFrame(
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[[0, val, 2], [3, 4, 5]],
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index=list("ab"),
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columns=["foo", "bar", "baz"],
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)
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tm.assert_frame_equal(left, right)
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assert is_integer_dtype(left["foo"])
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assert is_integer_dtype(left["baz"])
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left = DataFrame(
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np.arange(6, dtype="int64").reshape(2, 3) / 10.0,
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index=list("ab"),
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columns=["foo", "bar", "baz"],
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)
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left.loc["a", "bar"] = "wxyz"
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right = DataFrame(
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[[0, "wxyz", 0.2], [0.3, 0.4, 0.5]],
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index=list("ab"),
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columns=["foo", "bar", "baz"],
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)
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tm.assert_frame_equal(left, right)
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assert is_float_dtype(left["foo"])
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assert is_float_dtype(left["baz"])
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def test_dups_fancy_indexing(self):
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# GH 3455
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df = tm.makeCustomDataframe(10, 3)
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df.columns = ["a", "a", "b"]
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result = df[["b", "a"]].columns
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expected = Index(["b", "a", "a"])
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tm.assert_index_equal(result, expected)
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# across dtypes
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df = DataFrame([[1, 2, 1.0, 2.0, 3.0, "foo", "bar"]], columns=list("aaaaaaa"))
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df.head()
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str(df)
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result = DataFrame([[1, 2, 1.0, 2.0, 3.0, "foo", "bar"]])
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result.columns = list("aaaaaaa")
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# TODO(wesm): unused?
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df_v = df.iloc[:, 4] # noqa
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res_v = result.iloc[:, 4] # noqa
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tm.assert_frame_equal(df, result)
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# GH 3561, dups not in selected order
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df = DataFrame(
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{"test": [5, 7, 9, 11], "test1": [4.0, 5, 6, 7], "other": list("abcd")},
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index=["A", "A", "B", "C"],
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)
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rows = ["C", "B"]
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expected = DataFrame(
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{"test": [11, 9], "test1": [7.0, 6], "other": ["d", "c"]}, index=rows
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)
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result = df.loc[rows]
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tm.assert_frame_equal(result, expected)
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result = df.loc[Index(rows)]
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tm.assert_frame_equal(result, expected)
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rows = ["C", "B", "E"]
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with pytest.raises(KeyError, match="with any missing labels"):
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df.loc[rows]
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# see GH5553, make sure we use the right indexer
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rows = ["F", "G", "H", "C", "B", "E"]
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with pytest.raises(KeyError, match="with any missing labels"):
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df.loc[rows]
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# List containing only missing label
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dfnu = DataFrame(np.random.randn(5, 3), index=list("AABCD"))
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with pytest.raises(
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KeyError,
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match=re.escape(
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"\"None of [Index(['E'], dtype='object')] are in the [index]\""
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),
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):
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dfnu.loc[["E"]]
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# ToDo: check_index_type can be True after GH 11497
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# GH 4619; duplicate indexer with missing label
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df = DataFrame({"A": [0, 1, 2]})
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with pytest.raises(KeyError, match="with any missing labels"):
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df.loc[[0, 8, 0]]
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df = DataFrame({"A": list("abc")})
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with pytest.raises(KeyError, match="with any missing labels"):
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df.loc[[0, 8, 0]]
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# non unique with non unique selector
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df = DataFrame({"test": [5, 7, 9, 11]}, index=["A", "A", "B", "C"])
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with pytest.raises(KeyError, match="with any missing labels"):
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df.loc[["A", "A", "E"]]
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def test_dups_fancy_indexing2(self):
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# GH 5835
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# dups on index and missing values
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df = DataFrame(np.random.randn(5, 5), columns=["A", "B", "B", "B", "A"])
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with pytest.raises(KeyError, match="with any missing labels"):
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df.loc[:, ["A", "B", "C"]]
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# GH 6504, multi-axis indexing
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df = DataFrame(
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np.random.randn(9, 2), index=[1, 1, 1, 2, 2, 2, 3, 3, 3], columns=["a", "b"]
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)
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expected = df.iloc[0:6]
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result = df.loc[[1, 2]]
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tm.assert_frame_equal(result, expected)
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expected = df
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result = df.loc[:, ["a", "b"]]
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tm.assert_frame_equal(result, expected)
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expected = df.iloc[0:6, :]
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result = df.loc[[1, 2], ["a", "b"]]
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tm.assert_frame_equal(result, expected)
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@pytest.mark.parametrize("case", [getitem, loc])
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def test_duplicate_int_indexing(self, case):
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# GH 17347
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s = Series(range(3), index=[1, 1, 3])
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expected = s[1]
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result = case(s)[[1]]
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tm.assert_series_equal(result, expected)
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def test_indexing_mixed_frame_bug(self):
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# GH3492
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df = DataFrame(
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{"a": {1: "aaa", 2: "bbb", 3: "ccc"}, "b": {1: 111, 2: 222, 3: 333}}
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)
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# this works, new column is created correctly
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df["test"] = df["a"].apply(lambda x: "_" if x == "aaa" else x)
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# this does not work, ie column test is not changed
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idx = df["test"] == "_"
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temp = df.loc[idx, "a"].apply(lambda x: "-----" if x == "aaa" else x)
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df.loc[idx, "test"] = temp
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assert df.iloc[0, 2] == "-----"
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def test_multitype_list_index_access(self):
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# GH 10610
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df = DataFrame(np.random.random((10, 5)), columns=["a"] + [20, 21, 22, 23])
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with pytest.raises(KeyError, match=re.escape("'[-8, 26] not in index'")):
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df[[22, 26, -8]]
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assert df[21].shape[0] == df.shape[0]
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def test_set_index_nan(self):
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# GH 3586
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df = DataFrame(
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{
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"PRuid": {
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17: "nonQC",
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18: "nonQC",
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19: "nonQC",
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20: "10",
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21: "11",
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22: "12",
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23: "13",
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24: "24",
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25: "35",
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26: "46",
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27: "47",
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28: "48",
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29: "59",
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30: "10",
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},
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"QC": {
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17: 0.0,
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18: 0.0,
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19: 0.0,
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20: np.nan,
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21: np.nan,
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22: np.nan,
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23: np.nan,
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24: 1.0,
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25: np.nan,
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26: np.nan,
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27: np.nan,
|
||
|
|
28: np.nan,
|
||
|
|
29: np.nan,
|
||
|
|
30: np.nan,
|
||
|
|
},
|
||
|
|
"data": {
|
||
|
|
17: 7.9544899999999998,
|
||
|
|
18: 8.0142609999999994,
|
||
|
|
19: 7.8591520000000008,
|
||
|
|
20: 0.86140349999999999,
|
||
|
|
21: 0.87853110000000001,
|
||
|
|
22: 0.8427041999999999,
|
||
|
|
23: 0.78587700000000005,
|
||
|
|
24: 0.73062459999999996,
|
||
|
|
25: 0.81668560000000001,
|
||
|
|
26: 0.81927080000000008,
|
||
|
|
27: 0.80705009999999999,
|
||
|
|
28: 0.81440240000000008,
|
||
|
|
29: 0.80140849999999997,
|
||
|
|
30: 0.81307740000000006,
|
||
|
|
},
|
||
|
|
"year": {
|
||
|
|
17: 2006,
|
||
|
|
18: 2007,
|
||
|
|
19: 2008,
|
||
|
|
20: 1985,
|
||
|
|
21: 1985,
|
||
|
|
22: 1985,
|
||
|
|
23: 1985,
|
||
|
|
24: 1985,
|
||
|
|
25: 1985,
|
||
|
|
26: 1985,
|
||
|
|
27: 1985,
|
||
|
|
28: 1985,
|
||
|
|
29: 1985,
|
||
|
|
30: 1986,
|
||
|
|
},
|
||
|
|
}
|
||
|
|
).reset_index()
|
||
|
|
|
||
|
|
result = (
|
||
|
|
df.set_index(["year", "PRuid", "QC"])
|
||
|
|
.reset_index()
|
||
|
|
.reindex(columns=df.columns)
|
||
|
|
)
|
||
|
|
tm.assert_frame_equal(result, df)
|
||
|
|
|
||
|
|
def test_multi_assign(self):
|
||
|
|
|
||
|
|
# GH 3626, an assignment of a sub-df to a df
|
||
|
|
df = DataFrame(
|
||
|
|
{
|
||
|
|
"FC": ["a", "b", "a", "b", "a", "b"],
|
||
|
|
"PF": [0, 0, 0, 0, 1, 1],
|
||
|
|
"col1": list(range(6)),
|
||
|
|
"col2": list(range(6, 12)),
|
||
|
|
}
|
||
|
|
)
|
||
|
|
df.iloc[1, 0] = np.nan
|
||
|
|
df2 = df.copy()
|
||
|
|
|
||
|
|
mask = ~df2.FC.isna()
|
||
|
|
cols = ["col1", "col2"]
|
||
|
|
|
||
|
|
dft = df2 * 2
|
||
|
|
dft.iloc[3, 3] = np.nan
|
||
|
|
|
||
|
|
expected = DataFrame(
|
||
|
|
{
|
||
|
|
"FC": ["a", np.nan, "a", "b", "a", "b"],
|
||
|
|
"PF": [0, 0, 0, 0, 1, 1],
|
||
|
|
"col1": Series([0, 1, 4, 6, 8, 10]),
|
||
|
|
"col2": [12, 7, 16, np.nan, 20, 22],
|
||
|
|
}
|
||
|
|
)
|
||
|
|
|
||
|
|
# frame on rhs
|
||
|
|
df2.loc[mask, cols] = dft.loc[mask, cols]
|
||
|
|
tm.assert_frame_equal(df2, expected)
|
||
|
|
|
||
|
|
df2.loc[mask, cols] = dft.loc[mask, cols]
|
||
|
|
tm.assert_frame_equal(df2, expected)
|
||
|
|
|
||
|
|
# with an ndarray on rhs
|
||
|
|
# coerces to float64 because values has float64 dtype
|
||
|
|
# GH 14001
|
||
|
|
expected = DataFrame(
|
||
|
|
{
|
||
|
|
"FC": ["a", np.nan, "a", "b", "a", "b"],
|
||
|
|
"PF": [0, 0, 0, 0, 1, 1],
|
||
|
|
"col1": [0.0, 1.0, 4.0, 6.0, 8.0, 10.0],
|
||
|
|
"col2": [12, 7, 16, np.nan, 20, 22],
|
||
|
|
}
|
||
|
|
)
|
||
|
|
df2 = df.copy()
|
||
|
|
df2.loc[mask, cols] = dft.loc[mask, cols].values
|
||
|
|
tm.assert_frame_equal(df2, expected)
|
||
|
|
df2.loc[mask, cols] = dft.loc[mask, cols].values
|
||
|
|
tm.assert_frame_equal(df2, expected)
|
||
|
|
|
||
|
|
# broadcasting on the rhs is required
|
||
|
|
df = DataFrame(
|
||
|
|
{
|
||
|
|
"A": [1, 2, 0, 0, 0],
|
||
|
|
"B": [0, 0, 0, 10, 11],
|
||
|
|
"C": [0, 0, 0, 10, 11],
|
||
|
|
"D": [3, 4, 5, 6, 7],
|
||
|
|
}
|
||
|
|
)
|
||
|
|
|
||
|
|
expected = df.copy()
|
||
|
|
mask = expected["A"] == 0
|
||
|
|
for col in ["A", "B"]:
|
||
|
|
expected.loc[mask, col] = df["D"]
|
||
|
|
|
||
|
|
df.loc[df["A"] == 0, ["A", "B"]] = df["D"]
|
||
|
|
tm.assert_frame_equal(df, expected)
|
||
|
|
|
||
|
|
def test_setitem_list(self):
|
||
|
|
|
||
|
|
# GH 6043
|
||
|
|
# iloc with a list
|
||
|
|
df = DataFrame(index=[0, 1], columns=[0])
|
||
|
|
df.iloc[1, 0] = [1, 2, 3]
|
||
|
|
df.iloc[1, 0] = [1, 2]
|
||
|
|
|
||
|
|
result = DataFrame(index=[0, 1], columns=[0])
|
||
|
|
result.iloc[1, 0] = [1, 2]
|
||
|
|
|
||
|
|
tm.assert_frame_equal(result, df)
|
||
|
|
|
||
|
|
# iloc with an object
|
||
|
|
class TO:
|
||
|
|
def __init__(self, value):
|
||
|
|
self.value = value
|
||
|
|
|
||
|
|
def __str__(self) -> str:
|
||
|
|
return f"[{self.value}]"
|
||
|
|
|
||
|
|
__repr__ = __str__
|
||
|
|
|
||
|
|
def __eq__(self, other) -> bool:
|
||
|
|
return self.value == other.value
|
||
|
|
|
||
|
|
def view(self):
|
||
|
|
return self
|
||
|
|
|
||
|
|
df = DataFrame(index=[0, 1], columns=[0])
|
||
|
|
df.iloc[1, 0] = TO(1)
|
||
|
|
df.iloc[1, 0] = TO(2)
|
||
|
|
|
||
|
|
result = DataFrame(index=[0, 1], columns=[0])
|
||
|
|
result.iloc[1, 0] = TO(2)
|
||
|
|
|
||
|
|
tm.assert_frame_equal(result, df)
|
||
|
|
|
||
|
|
# remains object dtype even after setting it back
|
||
|
|
df = DataFrame(index=[0, 1], columns=[0])
|
||
|
|
df.iloc[1, 0] = TO(1)
|
||
|
|
df.iloc[1, 0] = np.nan
|
||
|
|
result = DataFrame(index=[0, 1], columns=[0])
|
||
|
|
|
||
|
|
tm.assert_frame_equal(result, df)
|
||
|
|
|
||
|
|
def test_string_slice(self):
|
||
|
|
# GH 14424
|
||
|
|
# string indexing against datetimelike with object
|
||
|
|
# dtype should properly raises KeyError
|
||
|
|
df = DataFrame([1], Index([pd.Timestamp("2011-01-01")], dtype=object))
|
||
|
|
assert df.index._is_all_dates
|
||
|
|
with pytest.raises(KeyError, match="'2011'"):
|
||
|
|
df["2011"]
|
||
|
|
|
||
|
|
with pytest.raises(KeyError, match="'2011'"):
|
||
|
|
df.loc["2011", 0]
|
||
|
|
|
||
|
|
df = DataFrame()
|
||
|
|
assert not df.index._is_all_dates
|
||
|
|
with pytest.raises(KeyError, match="'2011'"):
|
||
|
|
df["2011"]
|
||
|
|
|
||
|
|
with pytest.raises(KeyError, match="'2011'"):
|
||
|
|
df.loc["2011", 0]
|
||
|
|
|
||
|
|
def test_astype_assignment(self):
|
||
|
|
|
||
|
|
# GH4312 (iloc)
|
||
|
|
df_orig = DataFrame(
|
||
|
|
[["1", "2", "3", ".4", 5, 6.0, "foo"]], columns=list("ABCDEFG")
|
||
|
|
)
|
||
|
|
|
||
|
|
df = df_orig.copy()
|
||
|
|
df.iloc[:, 0:2] = df.iloc[:, 0:2].astype(np.int64)
|
||
|
|
expected = DataFrame(
|
||
|
|
[[1, 2, "3", ".4", 5, 6.0, "foo"]], columns=list("ABCDEFG")
|
||
|
|
)
|
||
|
|
tm.assert_frame_equal(df, expected)
|
||
|
|
|
||
|
|
df = df_orig.copy()
|
||
|
|
df.iloc[:, 0:2] = df.iloc[:, 0:2]._convert(datetime=True, numeric=True)
|
||
|
|
expected = DataFrame(
|
||
|
|
[[1, 2, "3", ".4", 5, 6.0, "foo"]], columns=list("ABCDEFG")
|
||
|
|
)
|
||
|
|
tm.assert_frame_equal(df, expected)
|
||
|
|
|
||
|
|
# GH5702 (loc)
|
||
|
|
df = df_orig.copy()
|
||
|
|
df.loc[:, "A"] = df.loc[:, "A"].astype(np.int64)
|
||
|
|
expected = DataFrame(
|
||
|
|
[[1, "2", "3", ".4", 5, 6.0, "foo"]], columns=list("ABCDEFG")
|
||
|
|
)
|
||
|
|
tm.assert_frame_equal(df, expected)
|
||
|
|
|
||
|
|
df = df_orig.copy()
|
||
|
|
df.loc[:, ["B", "C"]] = df.loc[:, ["B", "C"]].astype(np.int64)
|
||
|
|
expected = DataFrame(
|
||
|
|
[["1", 2, 3, ".4", 5, 6.0, "foo"]], columns=list("ABCDEFG")
|
||
|
|
)
|
||
|
|
tm.assert_frame_equal(df, expected)
|
||
|
|
|
||
|
|
# full replacements / no nans
|
||
|
|
df = DataFrame({"A": [1.0, 2.0, 3.0, 4.0]})
|
||
|
|
df.iloc[:, 0] = df["A"].astype(np.int64)
|
||
|
|
expected = DataFrame({"A": [1, 2, 3, 4]})
|
||
|
|
tm.assert_frame_equal(df, expected)
|
||
|
|
|
||
|
|
df = DataFrame({"A": [1.0, 2.0, 3.0, 4.0]})
|
||
|
|
df.loc[:, "A"] = df["A"].astype(np.int64)
|
||
|
|
expected = DataFrame({"A": [1, 2, 3, 4]})
|
||
|
|
tm.assert_frame_equal(df, expected)
|
||
|
|
|
||
|
|
@pytest.mark.parametrize("indexer", [getitem, loc])
|
||
|
|
def test_index_type_coercion(self, indexer):
|
||
|
|
|
||
|
|
# GH 11836
|
||
|
|
# if we have an index type and set it with something that looks
|
||
|
|
# to numpy like the same, but is actually, not
|
||
|
|
# (e.g. setting with a float or string '0')
|
||
|
|
# then we need to coerce to object
|
||
|
|
|
||
|
|
# integer indexes
|
||
|
|
for s in [Series(range(5)), Series(range(5), index=range(1, 6))]:
|
||
|
|
|
||
|
|
assert s.index.is_integer()
|
||
|
|
|
||
|
|
s2 = s.copy()
|
||
|
|
indexer(s2)[0.1] = 0
|
||
|
|
assert s2.index.is_floating()
|
||
|
|
assert indexer(s2)[0.1] == 0
|
||
|
|
|
||
|
|
s2 = s.copy()
|
||
|
|
indexer(s2)[0.0] = 0
|
||
|
|
exp = s.index
|
||
|
|
if 0 not in s:
|
||
|
|
exp = Index(s.index.tolist() + [0])
|
||
|
|
tm.assert_index_equal(s2.index, exp)
|
||
|
|
|
||
|
|
s2 = s.copy()
|
||
|
|
indexer(s2)["0"] = 0
|
||
|
|
assert s2.index.is_object()
|
||
|
|
|
||
|
|
for s in [Series(range(5), index=np.arange(5.0))]:
|
||
|
|
|
||
|
|
assert s.index.is_floating()
|
||
|
|
|
||
|
|
s2 = s.copy()
|
||
|
|
indexer(s2)[0.1] = 0
|
||
|
|
assert s2.index.is_floating()
|
||
|
|
assert indexer(s2)[0.1] == 0
|
||
|
|
|
||
|
|
s2 = s.copy()
|
||
|
|
indexer(s2)[0.0] = 0
|
||
|
|
tm.assert_index_equal(s2.index, s.index)
|
||
|
|
|
||
|
|
s2 = s.copy()
|
||
|
|
indexer(s2)["0"] = 0
|
||
|
|
assert s2.index.is_object()
|
||
|
|
|
||
|
|
|
||
|
|
class TestMisc:
|
||
|
|
def test_float_index_to_mixed(self):
|
||
|
|
df = DataFrame({0.0: np.random.rand(10), 1.0: np.random.rand(10)})
|
||
|
|
df["a"] = 10
|
||
|
|
tm.assert_frame_equal(
|
||
|
|
DataFrame({0.0: df[0.0], 1.0: df[1.0], "a": [10] * 10}), df
|
||
|
|
)
|
||
|
|
|
||
|
|
def test_float_index_non_scalar_assignment(self):
|
||
|
|
df = DataFrame({"a": [1, 2, 3], "b": [3, 4, 5]}, index=[1.0, 2.0, 3.0])
|
||
|
|
df.loc[df.index[:2]] = 1
|
||
|
|
expected = DataFrame({"a": [1, 1, 3], "b": [1, 1, 5]}, index=df.index)
|
||
|
|
tm.assert_frame_equal(expected, df)
|
||
|
|
|
||
|
|
df = DataFrame({"a": [1, 2, 3], "b": [3, 4, 5]}, index=[1.0, 2.0, 3.0])
|
||
|
|
df2 = df.copy()
|
||
|
|
df.loc[df.index] = df.loc[df.index]
|
||
|
|
tm.assert_frame_equal(df, df2)
|
||
|
|
|
||
|
|
def test_float_index_at_iat(self):
|
||
|
|
s = Series([1, 2, 3], index=[0.1, 0.2, 0.3])
|
||
|
|
for el, item in s.items():
|
||
|
|
assert s.at[el] == item
|
||
|
|
for i in range(len(s)):
|
||
|
|
assert s.iat[i] == i + 1
|
||
|
|
|
||
|
|
def test_rhs_alignment(self):
|
||
|
|
# GH8258, tests that both rows & columns are aligned to what is
|
||
|
|
# assigned to. covers both uniform data-type & multi-type cases
|
||
|
|
def run_tests(df, rhs, right_loc, right_iloc):
|
||
|
|
# label, index, slice
|
||
|
|
lbl_one, idx_one, slice_one = list("bcd"), [1, 2, 3], slice(1, 4)
|
||
|
|
lbl_two, idx_two, slice_two = ["joe", "jolie"], [1, 2], slice(1, 3)
|
||
|
|
|
||
|
|
left = df.copy()
|
||
|
|
left.loc[lbl_one, lbl_two] = rhs
|
||
|
|
tm.assert_frame_equal(left, right_loc)
|
||
|
|
|
||
|
|
left = df.copy()
|
||
|
|
left.iloc[idx_one, idx_two] = rhs
|
||
|
|
tm.assert_frame_equal(left, right_iloc)
|
||
|
|
|
||
|
|
left = df.copy()
|
||
|
|
left.iloc[slice_one, slice_two] = rhs
|
||
|
|
tm.assert_frame_equal(left, right_iloc)
|
||
|
|
|
||
|
|
xs = np.arange(20).reshape(5, 4)
|
||
|
|
cols = ["jim", "joe", "jolie", "joline"]
|
||
|
|
df = DataFrame(xs, columns=cols, index=list("abcde"), dtype="int64")
|
||
|
|
|
||
|
|
# right hand side; permute the indices and multiplpy by -2
|
||
|
|
rhs = -2 * df.iloc[3:0:-1, 2:0:-1]
|
||
|
|
|
||
|
|
# expected `right` result; just multiply by -2
|
||
|
|
right_iloc = df.copy()
|
||
|
|
right_iloc["joe"] = [1, 14, 10, 6, 17]
|
||
|
|
right_iloc["jolie"] = [2, 13, 9, 5, 18]
|
||
|
|
right_iloc.iloc[1:4, 1:3] *= -2
|
||
|
|
right_loc = df.copy()
|
||
|
|
right_loc.iloc[1:4, 1:3] *= -2
|
||
|
|
|
||
|
|
# run tests with uniform dtypes
|
||
|
|
run_tests(df, rhs, right_loc, right_iloc)
|
||
|
|
|
||
|
|
# make frames multi-type & re-run tests
|
||
|
|
for frame in [df, rhs, right_loc, right_iloc]:
|
||
|
|
frame["joe"] = frame["joe"].astype("float64")
|
||
|
|
frame["jolie"] = frame["jolie"].map("@{}".format)
|
||
|
|
right_iloc["joe"] = [1.0, "@-28", "@-20", "@-12", 17.0]
|
||
|
|
right_iloc["jolie"] = ["@2", -26.0, -18.0, -10.0, "@18"]
|
||
|
|
run_tests(df, rhs, right_loc, right_iloc)
|
||
|
|
|
||
|
|
def test_str_label_slicing_with_negative_step(self):
|
||
|
|
SLC = pd.IndexSlice
|
||
|
|
|
||
|
|
def assert_slices_equivalent(l_slc, i_slc):
|
||
|
|
tm.assert_series_equal(s.loc[l_slc], s.iloc[i_slc])
|
||
|
|
|
||
|
|
if not idx.is_integer:
|
||
|
|
# For integer indices, .loc and plain getitem are position-based.
|
||
|
|
tm.assert_series_equal(s[l_slc], s.iloc[i_slc])
|
||
|
|
tm.assert_series_equal(s.loc[l_slc], s.iloc[i_slc])
|
||
|
|
|
||
|
|
for idx in [_mklbl("A", 20), np.arange(20) + 100, np.linspace(100, 150, 20)]:
|
||
|
|
idx = Index(idx)
|
||
|
|
s = Series(np.arange(20), index=idx)
|
||
|
|
assert_slices_equivalent(SLC[idx[9] :: -1], SLC[9::-1])
|
||
|
|
assert_slices_equivalent(SLC[: idx[9] : -1], SLC[:8:-1])
|
||
|
|
assert_slices_equivalent(SLC[idx[13] : idx[9] : -1], SLC[13:8:-1])
|
||
|
|
assert_slices_equivalent(SLC[idx[9] : idx[13] : -1], SLC[:0])
|
||
|
|
|
||
|
|
def test_slice_with_zero_step_raises(self):
|
||
|
|
s = Series(np.arange(20), index=_mklbl("A", 20))
|
||
|
|
with pytest.raises(ValueError, match="slice step cannot be zero"):
|
||
|
|
s[::0]
|
||
|
|
with pytest.raises(ValueError, match="slice step cannot be zero"):
|
||
|
|
s.loc[::0]
|
||
|
|
|
||
|
|
def test_indexing_assignment_dict_already_exists(self):
|
||
|
|
df = DataFrame({"x": [1, 2, 6], "y": [2, 2, 8], "z": [-5, 0, 5]}).set_index("z")
|
||
|
|
expected = df.copy()
|
||
|
|
rhs = {"x": 9, "y": 99}
|
||
|
|
df.loc[5] = rhs
|
||
|
|
expected.loc[5] = [9, 99]
|
||
|
|
tm.assert_frame_equal(df, expected)
|
||
|
|
|
||
|
|
def test_indexing_dtypes_on_empty(self):
|
||
|
|
# Check that .iloc returns correct dtypes GH9983
|
||
|
|
df = DataFrame({"a": [1, 2, 3], "b": ["b", "b2", "b3"]})
|
||
|
|
df2 = df.iloc[[], :]
|
||
|
|
|
||
|
|
assert df2.loc[:, "a"].dtype == np.int64
|
||
|
|
tm.assert_series_equal(df2.loc[:, "a"], df2.iloc[:, 0])
|
||
|
|
|
||
|
|
@pytest.mark.parametrize("size", [5, 999999, 1000000])
|
||
|
|
def test_range_in_series_indexing(self, size):
|
||
|
|
# range can cause an indexing error
|
||
|
|
# GH 11652
|
||
|
|
s = Series(index=range(size), dtype=np.float64)
|
||
|
|
s.loc[range(1)] = 42
|
||
|
|
tm.assert_series_equal(s.loc[range(1)], Series(42.0, index=[0]))
|
||
|
|
|
||
|
|
s.loc[range(2)] = 43
|
||
|
|
tm.assert_series_equal(s.loc[range(2)], Series(43.0, index=[0, 1]))
|
||
|
|
|
||
|
|
@pytest.mark.parametrize(
|
||
|
|
"slc",
|
||
|
|
[
|
||
|
|
pd.IndexSlice[:, :],
|
||
|
|
pd.IndexSlice[:, 1],
|
||
|
|
pd.IndexSlice[1, :],
|
||
|
|
pd.IndexSlice[[1], [1]],
|
||
|
|
pd.IndexSlice[1, [1]],
|
||
|
|
pd.IndexSlice[[1], 1],
|
||
|
|
pd.IndexSlice[1],
|
||
|
|
pd.IndexSlice[1, 1],
|
||
|
|
slice(None, None, None),
|
||
|
|
[0, 1],
|
||
|
|
np.array([0, 1]),
|
||
|
|
Series([0, 1]),
|
||
|
|
],
|
||
|
|
)
|
||
|
|
def test_non_reducing_slice(self, slc):
|
||
|
|
df = DataFrame([[0, 1], [2, 3]])
|
||
|
|
|
||
|
|
tslice_ = non_reducing_slice(slc)
|
||
|
|
assert isinstance(df.loc[tslice_], DataFrame)
|
||
|
|
|
||
|
|
def test_list_slice(self):
|
||
|
|
# like dataframe getitem
|
||
|
|
slices = [["A"], Series(["A"]), np.array(["A"])]
|
||
|
|
df = DataFrame({"A": [1, 2], "B": [3, 4]}, index=["A", "B"])
|
||
|
|
expected = pd.IndexSlice[:, ["A"]]
|
||
|
|
for subset in slices:
|
||
|
|
result = non_reducing_slice(subset)
|
||
|
|
tm.assert_frame_equal(df.loc[result], df.loc[expected])
|
||
|
|
|
||
|
|
def test_maybe_numeric_slice(self):
|
||
|
|
df = DataFrame({"A": [1, 2], "B": ["c", "d"], "C": [True, False]})
|
||
|
|
result = maybe_numeric_slice(df, slice_=None)
|
||
|
|
expected = pd.IndexSlice[:, ["A"]]
|
||
|
|
assert result == expected
|
||
|
|
|
||
|
|
result = maybe_numeric_slice(df, None, include_bool=True)
|
||
|
|
expected = pd.IndexSlice[:, ["A", "C"]]
|
||
|
|
assert all(result[1] == expected[1])
|
||
|
|
result = maybe_numeric_slice(df, [1])
|
||
|
|
expected = [1]
|
||
|
|
assert result == expected
|
||
|
|
|
||
|
|
def test_partial_boolean_frame_indexing(self):
|
||
|
|
# GH 17170
|
||
|
|
df = DataFrame(
|
||
|
|
np.arange(9.0).reshape(3, 3), index=list("abc"), columns=list("ABC")
|
||
|
|
)
|
||
|
|
index_df = DataFrame(1, index=list("ab"), columns=list("AB"))
|
||
|
|
result = df[index_df.notnull()]
|
||
|
|
expected = DataFrame(
|
||
|
|
np.array([[0.0, 1.0, np.nan], [3.0, 4.0, np.nan], [np.nan] * 3]),
|
||
|
|
index=list("abc"),
|
||
|
|
columns=list("ABC"),
|
||
|
|
)
|
||
|
|
tm.assert_frame_equal(result, expected)
|
||
|
|
|
||
|
|
def test_no_reference_cycle(self):
|
||
|
|
df = DataFrame({"a": [0, 1], "b": [2, 3]})
|
||
|
|
for name in ("loc", "iloc", "at", "iat"):
|
||
|
|
getattr(df, name)
|
||
|
|
wr = weakref.ref(df)
|
||
|
|
del df
|
||
|
|
assert wr() is None
|
||
|
|
|
||
|
|
def test_label_indexing_on_nan(self):
|
||
|
|
# GH 32431
|
||
|
|
df = Series([1, "{1,2}", 1, None])
|
||
|
|
vc = df.value_counts(dropna=False)
|
||
|
|
result1 = vc.loc[np.nan]
|
||
|
|
result2 = vc[np.nan]
|
||
|
|
|
||
|
|
expected = 1
|
||
|
|
assert result1 == expected
|
||
|
|
assert result2 == expected
|
||
|
|
|
||
|
|
|
||
|
|
class TestSeriesNoneCoercion:
|
||
|
|
EXPECTED_RESULTS = [
|
||
|
|
# For numeric series, we should coerce to NaN.
|
||
|
|
([1, 2, 3], [np.nan, 2, 3]),
|
||
|
|
([1.0, 2.0, 3.0], [np.nan, 2.0, 3.0]),
|
||
|
|
# For datetime series, we should coerce to NaT.
|
||
|
|
(
|
||
|
|
[datetime(2000, 1, 1), datetime(2000, 1, 2), datetime(2000, 1, 3)],
|
||
|
|
[NaT, datetime(2000, 1, 2), datetime(2000, 1, 3)],
|
||
|
|
),
|
||
|
|
# For objects, we should preserve the None value.
|
||
|
|
(["foo", "bar", "baz"], [None, "bar", "baz"]),
|
||
|
|
]
|
||
|
|
|
||
|
|
@pytest.mark.parametrize("start_data,expected_result", EXPECTED_RESULTS)
|
||
|
|
def test_coercion_with_setitem(self, start_data, expected_result):
|
||
|
|
start_series = Series(start_data)
|
||
|
|
start_series[0] = None
|
||
|
|
|
||
|
|
expected_series = Series(expected_result)
|
||
|
|
tm.assert_series_equal(start_series, expected_series)
|
||
|
|
|
||
|
|
@pytest.mark.parametrize("start_data,expected_result", EXPECTED_RESULTS)
|
||
|
|
def test_coercion_with_loc_setitem(self, start_data, expected_result):
|
||
|
|
start_series = Series(start_data)
|
||
|
|
start_series.loc[0] = None
|
||
|
|
|
||
|
|
expected_series = Series(expected_result)
|
||
|
|
tm.assert_series_equal(start_series, expected_series)
|
||
|
|
|
||
|
|
@pytest.mark.parametrize("start_data,expected_result", EXPECTED_RESULTS)
|
||
|
|
def test_coercion_with_setitem_and_series(self, start_data, expected_result):
|
||
|
|
start_series = Series(start_data)
|
||
|
|
start_series[start_series == start_series[0]] = None
|
||
|
|
|
||
|
|
expected_series = Series(expected_result)
|
||
|
|
tm.assert_series_equal(start_series, expected_series)
|
||
|
|
|
||
|
|
@pytest.mark.parametrize("start_data,expected_result", EXPECTED_RESULTS)
|
||
|
|
def test_coercion_with_loc_and_series(self, start_data, expected_result):
|
||
|
|
start_series = Series(start_data)
|
||
|
|
start_series.loc[start_series == start_series[0]] = None
|
||
|
|
|
||
|
|
expected_series = Series(expected_result)
|
||
|
|
tm.assert_series_equal(start_series, expected_series)
|
||
|
|
|
||
|
|
|
||
|
|
class TestDataframeNoneCoercion:
|
||
|
|
EXPECTED_SINGLE_ROW_RESULTS = [
|
||
|
|
# For numeric series, we should coerce to NaN.
|
||
|
|
([1, 2, 3], [np.nan, 2, 3]),
|
||
|
|
([1.0, 2.0, 3.0], [np.nan, 2.0, 3.0]),
|
||
|
|
# For datetime series, we should coerce to NaT.
|
||
|
|
(
|
||
|
|
[datetime(2000, 1, 1), datetime(2000, 1, 2), datetime(2000, 1, 3)],
|
||
|
|
[NaT, datetime(2000, 1, 2), datetime(2000, 1, 3)],
|
||
|
|
),
|
||
|
|
# For objects, we should preserve the None value.
|
||
|
|
(["foo", "bar", "baz"], [None, "bar", "baz"]),
|
||
|
|
]
|
||
|
|
|
||
|
|
@pytest.mark.parametrize("expected", EXPECTED_SINGLE_ROW_RESULTS)
|
||
|
|
def test_coercion_with_loc(self, expected):
|
||
|
|
start_data, expected_result = expected
|
||
|
|
|
||
|
|
start_dataframe = DataFrame({"foo": start_data})
|
||
|
|
start_dataframe.loc[0, ["foo"]] = None
|
||
|
|
|
||
|
|
expected_dataframe = DataFrame({"foo": expected_result})
|
||
|
|
tm.assert_frame_equal(start_dataframe, expected_dataframe)
|
||
|
|
|
||
|
|
@pytest.mark.parametrize("expected", EXPECTED_SINGLE_ROW_RESULTS)
|
||
|
|
def test_coercion_with_setitem_and_dataframe(self, expected):
|
||
|
|
start_data, expected_result = expected
|
||
|
|
|
||
|
|
start_dataframe = DataFrame({"foo": start_data})
|
||
|
|
start_dataframe[start_dataframe["foo"] == start_dataframe["foo"][0]] = None
|
||
|
|
|
||
|
|
expected_dataframe = DataFrame({"foo": expected_result})
|
||
|
|
tm.assert_frame_equal(start_dataframe, expected_dataframe)
|
||
|
|
|
||
|
|
@pytest.mark.parametrize("expected", EXPECTED_SINGLE_ROW_RESULTS)
|
||
|
|
def test_none_coercion_loc_and_dataframe(self, expected):
|
||
|
|
start_data, expected_result = expected
|
||
|
|
|
||
|
|
start_dataframe = DataFrame({"foo": start_data})
|
||
|
|
start_dataframe.loc[start_dataframe["foo"] == start_dataframe["foo"][0]] = None
|
||
|
|
|
||
|
|
expected_dataframe = DataFrame({"foo": expected_result})
|
||
|
|
tm.assert_frame_equal(start_dataframe, expected_dataframe)
|
||
|
|
|
||
|
|
def test_none_coercion_mixed_dtypes(self):
|
||
|
|
start_dataframe = DataFrame(
|
||
|
|
{
|
||
|
|
"a": [1, 2, 3],
|
||
|
|
"b": [1.0, 2.0, 3.0],
|
||
|
|
"c": [datetime(2000, 1, 1), datetime(2000, 1, 2), datetime(2000, 1, 3)],
|
||
|
|
"d": ["a", "b", "c"],
|
||
|
|
}
|
||
|
|
)
|
||
|
|
start_dataframe.iloc[0] = None
|
||
|
|
|
||
|
|
exp = DataFrame(
|
||
|
|
{
|
||
|
|
"a": [np.nan, 2, 3],
|
||
|
|
"b": [np.nan, 2.0, 3.0],
|
||
|
|
"c": [NaT, datetime(2000, 1, 2), datetime(2000, 1, 3)],
|
||
|
|
"d": [None, "b", "c"],
|
||
|
|
}
|
||
|
|
)
|
||
|
|
tm.assert_frame_equal(start_dataframe, exp)
|
||
|
|
|
||
|
|
|
||
|
|
def test_extension_array_cross_section():
|
||
|
|
# A cross-section of a homogeneous EA should be an EA
|
||
|
|
df = DataFrame(
|
||
|
|
{
|
||
|
|
"A": pd.core.arrays.integer_array([1, 2]),
|
||
|
|
"B": pd.core.arrays.integer_array([3, 4]),
|
||
|
|
},
|
||
|
|
index=["a", "b"],
|
||
|
|
)
|
||
|
|
expected = Series(pd.core.arrays.integer_array([1, 3]), index=["A", "B"], name="a")
|
||
|
|
result = df.loc["a"]
|
||
|
|
tm.assert_series_equal(result, expected)
|
||
|
|
|
||
|
|
result = df.iloc[0]
|
||
|
|
tm.assert_series_equal(result, expected)
|
||
|
|
|
||
|
|
|
||
|
|
def test_extension_array_cross_section_converts():
|
||
|
|
# all numeric columns -> numeric series
|
||
|
|
df = DataFrame(
|
||
|
|
{"A": pd.array([1, 2], dtype="Int64"), "B": np.array([1, 2])}, index=["a", "b"]
|
||
|
|
)
|
||
|
|
result = df.loc["a"]
|
||
|
|
expected = Series([1, 1], dtype="Int64", index=["A", "B"], name="a")
|
||
|
|
tm.assert_series_equal(result, expected)
|
||
|
|
|
||
|
|
result = df.iloc[0]
|
||
|
|
tm.assert_series_equal(result, expected)
|
||
|
|
|
||
|
|
# mixed columns -> object series
|
||
|
|
df = DataFrame(
|
||
|
|
{"A": pd.array([1, 2], dtype="Int64"), "B": np.array(["a", "b"])},
|
||
|
|
index=["a", "b"],
|
||
|
|
)
|
||
|
|
result = df.loc["a"]
|
||
|
|
expected = Series([1, "a"], dtype=object, index=["A", "B"], name="a")
|
||
|
|
tm.assert_series_equal(result, expected)
|
||
|
|
|
||
|
|
result = df.iloc[0]
|
||
|
|
tm.assert_series_equal(result, expected)
|
||
|
|
|
||
|
|
|
||
|
|
def test_setitem_with_bool_mask_and_values_matching_n_trues_in_length():
|
||
|
|
# GH 30567
|
||
|
|
ser = Series([None] * 10)
|
||
|
|
mask = [False] * 3 + [True] * 5 + [False] * 2
|
||
|
|
ser[mask] = range(5)
|
||
|
|
result = ser
|
||
|
|
expected = Series([None] * 3 + list(range(5)) + [None] * 2).astype("object")
|
||
|
|
tm.assert_series_equal(result, expected)
|
||
|
|
|
||
|
|
|
||
|
|
def test_missing_labels_inside_loc_matched_in_error_message():
|
||
|
|
# GH34272
|
||
|
|
s = Series({"a": 1, "b": 2, "c": 3})
|
||
|
|
error_message_regex = "missing_0.*missing_1.*missing_2"
|
||
|
|
with pytest.raises(KeyError, match=error_message_regex):
|
||
|
|
s.loc[["a", "b", "missing_0", "c", "missing_1", "missing_2"]]
|
||
|
|
|
||
|
|
|
||
|
|
def test_many_missing_labels_inside_loc_error_message_limited():
|
||
|
|
# GH34272
|
||
|
|
n = 10000
|
||
|
|
missing_labels = [f"missing_{label}" for label in range(n)]
|
||
|
|
s = Series({"a": 1, "b": 2, "c": 3})
|
||
|
|
# regex checks labels between 4 and 9995 are replaced with ellipses
|
||
|
|
error_message_regex = "missing_4.*\\.\\.\\..*missing_9995"
|
||
|
|
with pytest.raises(KeyError, match=error_message_regex):
|
||
|
|
s.loc[["a", "c"] + missing_labels]
|
||
|
|
|
||
|
|
|
||
|
|
def test_long_text_missing_labels_inside_loc_error_message_limited():
|
||
|
|
# GH34272
|
||
|
|
s = Series({"a": 1, "b": 2, "c": 3})
|
||
|
|
missing_labels = [f"long_missing_label_text_{i}" * 5 for i in range(3)]
|
||
|
|
# regex checks for very long labels there are new lines between each
|
||
|
|
error_message_regex = "long_missing_label_text_0.*\\\\n.*long_missing_label_text_1"
|
||
|
|
with pytest.raises(KeyError, match=error_message_regex):
|
||
|
|
s.loc[["a", "c"] + missing_labels]
|
||
|
|
|
||
|
|
|
||
|
|
def test_setitem_categorical():
|
||
|
|
# https://github.com/pandas-dev/pandas/issues/35369
|
||
|
|
df = DataFrame({"h": Series(list("mn")).astype("category")})
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df.h = df.h.cat.reorder_categories(["n", "m"])
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expected = DataFrame(
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{"h": pd.Categorical(["m", "n"]).reorder_categories(["n", "m"])}
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)
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tm.assert_frame_equal(df, expected)
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