import collections
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import numpy as np
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import pytest
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from pandas.core.dtypes.dtypes import CategoricalDtype
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import pandas as pd
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from pandas import (
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Categorical,
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DataFrame,
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Index,
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Series,
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isna,
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)
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import pandas._testing as tm
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class TestCategoricalMissing:
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def test_isna(self):
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exp = np.array([False, False, True])
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cat = Categorical(["a", "b", np.nan])
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res = cat.isna()
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tm.assert_numpy_array_equal(res, exp)
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def test_na_flags_int_categories(self):
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# #1457
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categories = list(range(10))
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labels = np.random.randint(0, 10, 20)
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labels[::5] = -1
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cat = Categorical(labels, categories, fastpath=True)
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repr(cat)
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tm.assert_numpy_array_equal(isna(cat), labels == -1)
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def test_nan_handling(self):
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# Nans are represented as -1 in codes
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c = Categorical(["a", "b", np.nan, "a"])
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tm.assert_index_equal(c.categories, Index(["a", "b"]))
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tm.assert_numpy_array_equal(c._codes, np.array([0, 1, -1, 0], dtype=np.int8))
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c[1] = np.nan
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tm.assert_index_equal(c.categories, Index(["a", "b"]))
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tm.assert_numpy_array_equal(c._codes, np.array([0, -1, -1, 0], dtype=np.int8))
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# Adding nan to categories should make assigned nan point to the
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# category!
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c = Categorical(["a", "b", np.nan, "a"])
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tm.assert_index_equal(c.categories, Index(["a", "b"]))
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tm.assert_numpy_array_equal(c._codes, np.array([0, 1, -1, 0], dtype=np.int8))
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def test_set_dtype_nans(self):
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c = Categorical(["a", "b", np.nan])
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result = c._set_dtype(CategoricalDtype(["a", "c"]))
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tm.assert_numpy_array_equal(result.codes, np.array([0, -1, -1], dtype="int8"))
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def test_set_item_nan(self):
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cat = Categorical([1, 2, 3])
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cat[1] = np.nan
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exp = Categorical([1, np.nan, 3], categories=[1, 2, 3])
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tm.assert_categorical_equal(cat, exp)
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@pytest.mark.parametrize(
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"fillna_kwargs, msg",
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[
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(
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{"value": 1, "method": "ffill"},
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"Cannot specify both 'value' and 'method'.",
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),
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({}, "Must specify a fill 'value' or 'method'."),
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({"method": "bad"}, "Invalid fill method. Expecting .* bad"),
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(
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{"value": Series([1, 2, 3, 4, "a"])},
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"Cannot setitem on a Categorical with a new category",
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),
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],
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)
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def test_fillna_raises(self, fillna_kwargs, msg):
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# https://github.com/pandas-dev/pandas/issues/19682
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# https://github.com/pandas-dev/pandas/issues/13628
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cat = Categorical([1, 2, 3, None, None])
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if len(fillna_kwargs) == 1 and "value" in fillna_kwargs:
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err = TypeError
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else:
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err = ValueError
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with pytest.raises(err, match=msg):
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cat.fillna(**fillna_kwargs)
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@pytest.mark.parametrize("named", [True, False])
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def test_fillna_iterable_category(self, named):
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# https://github.com/pandas-dev/pandas/issues/21097
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if named:
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Point = collections.namedtuple("Point", "x y")
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else:
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Point = lambda *args: args # tuple
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cat = Categorical(np.array([Point(0, 0), Point(0, 1), None], dtype=object))
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result = cat.fillna(Point(0, 0))
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expected = Categorical([Point(0, 0), Point(0, 1), Point(0, 0)])
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tm.assert_categorical_equal(result, expected)
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# Case where the Point is not among our categories; we want ValueError,
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# not NotImplementedError GH#41914
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cat = Categorical(np.array([Point(1, 0), Point(0, 1), None], dtype=object))
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msg = "Cannot setitem on a Categorical with a new category"
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with pytest.raises(TypeError, match=msg):
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cat.fillna(Point(0, 0))
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def test_fillna_array(self):
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# accept Categorical or ndarray value if it holds appropriate values
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cat = Categorical(["A", "B", "C", None, None])
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other = cat.fillna("C")
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result = cat.fillna(other)
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tm.assert_categorical_equal(result, other)
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assert isna(cat[-1]) # didn't modify original inplace
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other = np.array(["A", "B", "C", "B", "A"])
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result = cat.fillna(other)
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expected = Categorical(["A", "B", "C", "B", "A"], dtype=cat.dtype)
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tm.assert_categorical_equal(result, expected)
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assert isna(cat[-1]) # didn't modify original inplace
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@pytest.mark.parametrize(
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"values, expected",
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[
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([1, 2, 3], np.array([False, False, False])),
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([1, 2, np.nan], np.array([False, False, True])),
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([1, 2, np.inf], np.array([False, False, True])),
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([1, 2, pd.NA], np.array([False, False, True])),
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],
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)
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def test_use_inf_as_na(self, values, expected):
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# https://github.com/pandas-dev/pandas/issues/33594
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with pd.option_context("mode.use_inf_as_na", True):
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cat = Categorical(values)
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result = cat.isna()
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tm.assert_numpy_array_equal(result, expected)
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result = Series(cat).isna()
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expected = Series(expected)
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tm.assert_series_equal(result, expected)
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result = DataFrame(cat).isna()
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expected = DataFrame(expected)
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tm.assert_frame_equal(result, expected)
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@pytest.mark.parametrize(
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"values, expected",
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[
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([1, 2, 3], np.array([False, False, False])),
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([1, 2, np.nan], np.array([False, False, True])),
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([1, 2, np.inf], np.array([False, False, True])),
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([1, 2, pd.NA], np.array([False, False, True])),
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],
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)
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def test_use_inf_as_na_outside_context(self, values, expected):
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# https://github.com/pandas-dev/pandas/issues/33594
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# Using isna directly for Categorical will fail in general here
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cat = Categorical(values)
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with pd.option_context("mode.use_inf_as_na", True):
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result = isna(cat)
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tm.assert_numpy_array_equal(result, expected)
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result = isna(Series(cat))
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expected = Series(expected)
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tm.assert_series_equal(result, expected)
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result = isna(DataFrame(cat))
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expected = DataFrame(expected)
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tm.assert_frame_equal(result, expected)
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@pytest.mark.parametrize(
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"a1, a2, categories",
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[
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(["a", "b", "c"], [np.nan, "a", "b"], ["a", "b", "c"]),
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([1, 2, 3], [np.nan, 1, 2], [1, 2, 3]),
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],
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)
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def test_compare_categorical_with_missing(self, a1, a2, categories):
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# GH 28384
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cat_type = CategoricalDtype(categories)
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# !=
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result = Series(a1, dtype=cat_type) != Series(a2, dtype=cat_type)
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expected = Series(a1) != Series(a2)
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tm.assert_series_equal(result, expected)
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# ==
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result = Series(a1, dtype=cat_type) == Series(a2, dtype=cat_type)
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expected = Series(a1) == Series(a2)
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tm.assert_series_equal(result, expected)
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@pytest.mark.parametrize(
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"na_value, dtype",
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[
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(pd.NaT, "datetime64[ns]"),
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(None, "float64"),
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(np.nan, "float64"),
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(pd.NA, "float64"),
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],
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)
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def test_categorical_only_missing_values_no_cast(self, na_value, dtype):
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# GH#44900
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result = Categorical([na_value, na_value])
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tm.assert_index_equal(result.categories, Index([], dtype=dtype))
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