220 lines
7.2 KiB
Python
220 lines
7.2 KiB
Python
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import numpy as np
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import pytest
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import pandas as pd
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from pandas import (
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DataFrame,
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MultiIndex,
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Series,
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)
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import pandas._testing as tm
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class TestDataFrameIsIn:
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def test_isin(self):
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# GH#4211
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df = DataFrame(
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{
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"vals": [1, 2, 3, 4],
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"ids": ["a", "b", "f", "n"],
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"ids2": ["a", "n", "c", "n"],
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},
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index=["foo", "bar", "baz", "qux"],
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)
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other = ["a", "b", "c"]
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result = df.isin(other)
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expected = DataFrame([df.loc[s].isin(other) for s in df.index])
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tm.assert_frame_equal(result, expected)
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@pytest.mark.parametrize("empty", [[], Series(dtype=object), np.array([])])
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def test_isin_empty(self, empty):
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# GH#16991
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df = DataFrame({"A": ["a", "b", "c"], "B": ["a", "e", "f"]})
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expected = DataFrame(False, df.index, df.columns)
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result = df.isin(empty)
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tm.assert_frame_equal(result, expected)
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def test_isin_dict(self):
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df = DataFrame({"A": ["a", "b", "c"], "B": ["a", "e", "f"]})
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d = {"A": ["a"]}
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expected = DataFrame(False, df.index, df.columns)
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expected.loc[0, "A"] = True
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result = df.isin(d)
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tm.assert_frame_equal(result, expected)
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# non unique columns
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df = DataFrame({"A": ["a", "b", "c"], "B": ["a", "e", "f"]})
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df.columns = ["A", "A"]
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expected = DataFrame(False, df.index, df.columns)
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expected.loc[0, "A"] = True
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result = df.isin(d)
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tm.assert_frame_equal(result, expected)
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def test_isin_with_string_scalar(self):
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# GH#4763
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df = DataFrame(
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{
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"vals": [1, 2, 3, 4],
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"ids": ["a", "b", "f", "n"],
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"ids2": ["a", "n", "c", "n"],
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},
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index=["foo", "bar", "baz", "qux"],
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)
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msg = (
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r"only list-like or dict-like objects are allowed "
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r"to be passed to DataFrame.isin\(\), you passed a 'str'"
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)
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with pytest.raises(TypeError, match=msg):
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df.isin("a")
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with pytest.raises(TypeError, match=msg):
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df.isin("aaa")
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def test_isin_df(self):
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df1 = DataFrame({"A": [1, 2, 3, 4], "B": [2, np.nan, 4, 4]})
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df2 = DataFrame({"A": [0, 2, 12, 4], "B": [2, np.nan, 4, 5]})
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expected = DataFrame(False, df1.index, df1.columns)
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result = df1.isin(df2)
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expected.loc[[1, 3], "A"] = True
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expected.loc[[0, 2], "B"] = True
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tm.assert_frame_equal(result, expected)
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# partial overlapping columns
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df2.columns = ["A", "C"]
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result = df1.isin(df2)
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expected["B"] = False
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tm.assert_frame_equal(result, expected)
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def test_isin_tuples(self):
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# GH#16394
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df = DataFrame({"A": [1, 2, 3], "B": ["a", "b", "f"]})
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df["C"] = list(zip(df["A"], df["B"]))
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result = df["C"].isin([(1, "a")])
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tm.assert_series_equal(result, Series([True, False, False], name="C"))
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def test_isin_df_dupe_values(self):
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df1 = DataFrame({"A": [1, 2, 3, 4], "B": [2, np.nan, 4, 4]})
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# just cols duped
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df2 = DataFrame([[0, 2], [12, 4], [2, np.nan], [4, 5]], columns=["B", "B"])
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msg = r"cannot compute isin with a duplicate axis\."
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with pytest.raises(ValueError, match=msg):
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df1.isin(df2)
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# just index duped
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df2 = DataFrame(
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[[0, 2], [12, 4], [2, np.nan], [4, 5]],
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columns=["A", "B"],
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index=[0, 0, 1, 1],
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)
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with pytest.raises(ValueError, match=msg):
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df1.isin(df2)
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# cols and index:
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df2.columns = ["B", "B"]
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with pytest.raises(ValueError, match=msg):
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df1.isin(df2)
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def test_isin_dupe_self(self):
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other = DataFrame({"A": [1, 0, 1, 0], "B": [1, 1, 0, 0]})
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df = DataFrame([[1, 1], [1, 0], [0, 0]], columns=["A", "A"])
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result = df.isin(other)
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expected = DataFrame(False, index=df.index, columns=df.columns)
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expected.loc[0] = True
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expected.iloc[1, 1] = True
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tm.assert_frame_equal(result, expected)
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def test_isin_against_series(self):
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df = DataFrame(
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{"A": [1, 2, 3, 4], "B": [2, np.nan, 4, 4]}, index=["a", "b", "c", "d"]
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)
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s = Series([1, 3, 11, 4], index=["a", "b", "c", "d"])
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expected = DataFrame(False, index=df.index, columns=df.columns)
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expected.loc["a", "A"] = True
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expected.loc["d"] = True
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result = df.isin(s)
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tm.assert_frame_equal(result, expected)
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def test_isin_multiIndex(self):
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idx = MultiIndex.from_tuples(
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[
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(0, "a", "foo"),
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(0, "a", "bar"),
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(0, "b", "bar"),
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(0, "b", "baz"),
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(2, "a", "foo"),
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(2, "a", "bar"),
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(2, "c", "bar"),
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(2, "c", "baz"),
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(1, "b", "foo"),
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(1, "b", "bar"),
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(1, "c", "bar"),
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(1, "c", "baz"),
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]
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)
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df1 = DataFrame({"A": np.ones(12), "B": np.zeros(12)}, index=idx)
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df2 = DataFrame(
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{
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"A": [1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1],
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"B": [1, 1, 0, 1, 1, 0, 0, 1, 1, 1, 1, 1],
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}
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)
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# against regular index
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expected = DataFrame(False, index=df1.index, columns=df1.columns)
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result = df1.isin(df2)
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tm.assert_frame_equal(result, expected)
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df2.index = idx
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expected = df2.values.astype(bool)
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expected[:, 1] = ~expected[:, 1]
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expected = DataFrame(expected, columns=["A", "B"], index=idx)
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result = df1.isin(df2)
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tm.assert_frame_equal(result, expected)
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def test_isin_empty_datetimelike(self):
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# GH#15473
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df1_ts = DataFrame({"date": pd.to_datetime(["2014-01-01", "2014-01-02"])})
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df1_td = DataFrame({"date": [pd.Timedelta(1, "s"), pd.Timedelta(2, "s")]})
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df2 = DataFrame({"date": []})
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df3 = DataFrame()
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expected = DataFrame({"date": [False, False]})
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result = df1_ts.isin(df2)
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tm.assert_frame_equal(result, expected)
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result = df1_ts.isin(df3)
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tm.assert_frame_equal(result, expected)
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result = df1_td.isin(df2)
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tm.assert_frame_equal(result, expected)
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result = df1_td.isin(df3)
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tm.assert_frame_equal(result, expected)
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@pytest.mark.parametrize(
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"values",
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[
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DataFrame({"a": [1, 2, 3]}, dtype="category"),
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Series([1, 2, 3], dtype="category"),
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],
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)
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def test_isin_category_frame(self, values):
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# GH#34256
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df = DataFrame({"a": [1, 2, 3], "b": [4, 5, 6]})
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expected = DataFrame({"a": [True, True, True], "b": [False, False, False]})
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result = df.isin(values)
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tm.assert_frame_equal(result, expected)
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def test_isin_read_only(self):
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# https://github.com/pandas-dev/pandas/issues/37174
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arr = np.array([1, 2, 3])
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arr.setflags(write=False)
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df = DataFrame([1, 2, 3])
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result = df.isin(arr)
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expected = DataFrame([True, True, True])
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tm.assert_frame_equal(result, expected)
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