370 lines
12 KiB
Python
370 lines
12 KiB
Python
import numpy as np
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import pytest
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from pandas import (
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Categorical,
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CategoricalIndex,
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Index,
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Interval,
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IntervalIndex,
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PeriodIndex,
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Series,
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Timedelta,
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Timestamp,
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)
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import pandas._testing as tm
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import pandas.core.common as com
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from pandas.tests.arrays.categorical.common import TestCategorical
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class TestCategoricalIndexingWithFactor(TestCategorical):
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def test_getitem(self):
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assert self.factor[0] == "a"
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assert self.factor[-1] == "c"
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subf = self.factor[[0, 1, 2]]
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tm.assert_numpy_array_equal(subf._codes, np.array([0, 1, 1], dtype=np.int8))
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subf = self.factor[np.asarray(self.factor) == "c"]
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tm.assert_numpy_array_equal(subf._codes, np.array([2, 2, 2], dtype=np.int8))
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def test_setitem(self):
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# int/positional
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c = self.factor.copy()
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c[0] = "b"
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assert c[0] == "b"
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c[-1] = "a"
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assert c[-1] == "a"
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# boolean
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c = self.factor.copy()
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indexer = np.zeros(len(c), dtype="bool")
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indexer[0] = True
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indexer[-1] = True
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c[indexer] = "c"
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expected = Categorical(["c", "b", "b", "a", "a", "c", "c", "c"], ordered=True)
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tm.assert_categorical_equal(c, expected)
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@pytest.mark.parametrize(
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"other",
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[Categorical(["b", "a"]), Categorical(["b", "a"], categories=["b", "a"])],
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)
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def test_setitem_same_but_unordered(self, other):
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# GH-24142
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target = Categorical(["a", "b"], categories=["a", "b"])
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mask = np.array([True, False])
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target[mask] = other[mask]
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expected = Categorical(["b", "b"], categories=["a", "b"])
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tm.assert_categorical_equal(target, expected)
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@pytest.mark.parametrize(
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"other",
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[
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Categorical(["b", "a"], categories=["b", "a", "c"]),
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Categorical(["b", "a"], categories=["a", "b", "c"]),
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Categorical(["a", "a"], categories=["a"]),
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Categorical(["b", "b"], categories=["b"]),
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],
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)
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def test_setitem_different_unordered_raises(self, other):
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# GH-24142
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target = Categorical(["a", "b"], categories=["a", "b"])
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mask = np.array([True, False])
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msg = "Cannot set a Categorical with another, without identical categories"
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with pytest.raises(ValueError, match=msg):
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target[mask] = other[mask]
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@pytest.mark.parametrize(
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"other",
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[
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Categorical(["b", "a"]),
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Categorical(["b", "a"], categories=["b", "a"], ordered=True),
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Categorical(["b", "a"], categories=["a", "b", "c"], ordered=True),
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],
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)
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def test_setitem_same_ordered_raises(self, other):
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# Gh-24142
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target = Categorical(["a", "b"], categories=["a", "b"], ordered=True)
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mask = np.array([True, False])
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msg = "Cannot set a Categorical with another, without identical categories"
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with pytest.raises(ValueError, match=msg):
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target[mask] = other[mask]
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def test_setitem_tuple(self):
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# GH#20439
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cat = Categorical([(0, 1), (0, 2), (0, 1)])
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# This should not raise
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cat[1] = cat[0]
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assert cat[1] == (0, 1)
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def test_setitem_listlike(self):
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# GH#9469
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# properly coerce the input indexers
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np.random.seed(1)
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c = Categorical(
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np.random.randint(0, 5, size=150000).astype(np.int8)
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).add_categories([-1000])
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indexer = np.array([100000]).astype(np.int64)
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c[indexer] = -1000
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# we are asserting the code result here
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# which maps to the -1000 category
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result = c.codes[np.array([100000]).astype(np.int64)]
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tm.assert_numpy_array_equal(result, np.array([5], dtype="int8"))
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class TestCategoricalIndexing:
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def test_getitem_slice(self):
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cat = Categorical(["a", "b", "c", "d", "a", "b", "c"])
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sliced = cat[3]
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assert sliced == "d"
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sliced = cat[3:5]
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expected = Categorical(["d", "a"], categories=["a", "b", "c", "d"])
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tm.assert_categorical_equal(sliced, expected)
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def test_getitem_listlike(self):
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# GH 9469
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# properly coerce the input indexers
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np.random.seed(1)
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c = Categorical(np.random.randint(0, 5, size=150000).astype(np.int8))
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result = c.codes[np.array([100000]).astype(np.int64)]
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expected = c[np.array([100000]).astype(np.int64)].codes
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tm.assert_numpy_array_equal(result, expected)
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def test_periodindex(self):
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idx1 = PeriodIndex(
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["2014-01", "2014-01", "2014-02", "2014-02", "2014-03", "2014-03"], freq="M"
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)
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cat1 = Categorical(idx1)
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str(cat1)
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exp_arr = np.array([0, 0, 1, 1, 2, 2], dtype=np.int8)
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exp_idx = PeriodIndex(["2014-01", "2014-02", "2014-03"], freq="M")
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tm.assert_numpy_array_equal(cat1._codes, exp_arr)
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tm.assert_index_equal(cat1.categories, exp_idx)
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idx2 = PeriodIndex(
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["2014-03", "2014-03", "2014-02", "2014-01", "2014-03", "2014-01"], freq="M"
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)
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cat2 = Categorical(idx2, ordered=True)
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str(cat2)
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exp_arr = np.array([2, 2, 1, 0, 2, 0], dtype=np.int8)
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exp_idx2 = PeriodIndex(["2014-01", "2014-02", "2014-03"], freq="M")
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tm.assert_numpy_array_equal(cat2._codes, exp_arr)
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tm.assert_index_equal(cat2.categories, exp_idx2)
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idx3 = PeriodIndex(
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[
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"2013-12",
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"2013-11",
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"2013-10",
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"2013-09",
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"2013-08",
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"2013-07",
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"2013-05",
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],
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freq="M",
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)
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cat3 = Categorical(idx3, ordered=True)
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exp_arr = np.array([6, 5, 4, 3, 2, 1, 0], dtype=np.int8)
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exp_idx = PeriodIndex(
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[
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"2013-05",
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"2013-07",
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"2013-08",
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"2013-09",
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"2013-10",
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"2013-11",
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"2013-12",
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],
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freq="M",
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)
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tm.assert_numpy_array_equal(cat3._codes, exp_arr)
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tm.assert_index_equal(cat3.categories, exp_idx)
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def test_categories_assignments(self):
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s = Categorical(["a", "b", "c", "a"])
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exp = np.array([1, 2, 3, 1], dtype=np.int64)
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s.categories = [1, 2, 3]
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tm.assert_numpy_array_equal(s.__array__(), exp)
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tm.assert_index_equal(s.categories, Index([1, 2, 3]))
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@pytest.mark.parametrize("new_categories", [[1, 2, 3, 4], [1, 2]])
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def test_categories_assignments_wrong_length_raises(self, new_categories):
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cat = Categorical(["a", "b", "c", "a"])
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msg = (
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"new categories need to have the same number of items "
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"as the old categories!"
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)
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with pytest.raises(ValueError, match=msg):
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cat.categories = new_categories
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# Combinations of sorted/unique:
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@pytest.mark.parametrize(
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"idx_values", [[1, 2, 3, 4], [1, 3, 2, 4], [1, 3, 3, 4], [1, 2, 2, 4]]
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)
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# Combinations of missing/unique
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@pytest.mark.parametrize("key_values", [[1, 2], [1, 5], [1, 1], [5, 5]])
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@pytest.mark.parametrize("key_class", [Categorical, CategoricalIndex])
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def test_get_indexer_non_unique(self, idx_values, key_values, key_class):
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# GH 21448
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key = key_class(key_values, categories=range(1, 5))
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# Test for flat index and CategoricalIndex with same/different cats:
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for dtype in [None, "category", key.dtype]:
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idx = Index(idx_values, dtype=dtype)
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expected, exp_miss = idx.get_indexer_non_unique(key_values)
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result, res_miss = idx.get_indexer_non_unique(key)
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tm.assert_numpy_array_equal(expected, result)
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tm.assert_numpy_array_equal(exp_miss, res_miss)
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def test_where_unobserved_nan(self):
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ser = Series(Categorical(["a", "b"]))
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result = ser.where([True, False])
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expected = Series(Categorical(["a", None], categories=["a", "b"]))
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tm.assert_series_equal(result, expected)
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# all NA
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ser = Series(Categorical(["a", "b"]))
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result = ser.where([False, False])
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expected = Series(Categorical([None, None], categories=["a", "b"]))
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tm.assert_series_equal(result, expected)
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def test_where_unobserved_categories(self):
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ser = Series(Categorical(["a", "b", "c"], categories=["d", "c", "b", "a"]))
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result = ser.where([True, True, False], other="b")
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expected = Series(Categorical(["a", "b", "b"], categories=ser.cat.categories))
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tm.assert_series_equal(result, expected)
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def test_where_other_categorical(self):
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ser = Series(Categorical(["a", "b", "c"], categories=["d", "c", "b", "a"]))
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other = Categorical(["b", "c", "a"], categories=["a", "c", "b", "d"])
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result = ser.where([True, False, True], other)
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expected = Series(Categorical(["a", "c", "c"], dtype=ser.dtype))
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tm.assert_series_equal(result, expected)
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def test_where_new_category_raises(self):
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ser = Series(Categorical(["a", "b", "c"]))
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msg = "Cannot setitem on a Categorical with a new category"
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with pytest.raises(ValueError, match=msg):
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ser.where([True, False, True], "d")
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def test_where_ordered_differs_rasies(self):
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ser = Series(
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Categorical(["a", "b", "c"], categories=["d", "c", "b", "a"], ordered=True)
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)
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other = Categorical(
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["b", "c", "a"], categories=["a", "c", "b", "d"], ordered=True
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)
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with pytest.raises(ValueError, match="without identical categories"):
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ser.where([True, False, True], other)
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class TestContains:
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def test_contains(self):
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# GH#21508
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c = Categorical(list("aabbca"), categories=list("cab"))
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assert "b" in c
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assert "z" not in c
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assert np.nan not in c
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with pytest.raises(TypeError, match="unhashable type: 'list'"):
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assert [1] in c
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# assert codes NOT in index
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assert 0 not in c
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assert 1 not in c
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c = Categorical(list("aabbca") + [np.nan], categories=list("cab"))
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assert np.nan in c
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@pytest.mark.parametrize(
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"item, expected",
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[
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(Interval(0, 1), True),
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(1.5, True),
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(Interval(0.5, 1.5), False),
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("a", False),
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(Timestamp(1), False),
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(Timedelta(1), False),
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],
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ids=str,
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)
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def test_contains_interval(self, item, expected):
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# GH#23705
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cat = Categorical(IntervalIndex.from_breaks(range(3)))
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result = item in cat
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assert result is expected
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def test_contains_list(self):
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# GH#21729
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cat = Categorical([1, 2, 3])
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assert "a" not in cat
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with pytest.raises(TypeError, match="unhashable type"):
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["a"] in cat
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with pytest.raises(TypeError, match="unhashable type"):
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["a", "b"] in cat
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@pytest.mark.parametrize("index", [True, False])
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def test_mask_with_boolean(index):
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s = Series(range(3))
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idx = Categorical([True, False, True])
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if index:
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idx = CategoricalIndex(idx)
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assert com.is_bool_indexer(idx)
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result = s[idx]
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expected = s[idx.astype("object")]
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tm.assert_series_equal(result, expected)
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@pytest.mark.parametrize("index", [True, False])
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def test_mask_with_boolean_na_treated_as_false(index):
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# https://github.com/pandas-dev/pandas/issues/31503
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s = Series(range(3))
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idx = Categorical([True, False, None])
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if index:
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idx = CategoricalIndex(idx)
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result = s[idx]
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expected = s[idx.fillna(False)]
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tm.assert_series_equal(result, expected)
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@pytest.fixture
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def non_coercible_categorical(monkeypatch):
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"""
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Monkeypatch Categorical.__array__ to ensure no implicit conversion.
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Raises
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------
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ValueError
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When Categorical.__array__ is called.
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"""
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# TODO(Categorical): identify other places where this may be
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# useful and move to a conftest.py
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def array(self, dtype=None):
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raise ValueError("I cannot be converted.")
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with monkeypatch.context() as m:
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m.setattr(Categorical, "__array__", array)
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yield
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def test_series_at(non_coercible_categorical):
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arr = Categorical(["a", "b", "c"])
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ser = Series(arr)
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result = ser.at[0]
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assert result == "a"
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