import pytest
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from pandas import (
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CategoricalIndex,
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Index,
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)
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import pandas._testing as tm
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class TestAppend:
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@pytest.fixture
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def ci(self):
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categories = list("cab")
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return CategoricalIndex(list("aabbca"), categories=categories, ordered=False)
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def test_append(self, ci):
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# append cats with the same categories
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result = ci[:3].append(ci[3:])
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tm.assert_index_equal(result, ci, exact=True)
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foos = [ci[:1], ci[1:3], ci[3:]]
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result = foos[0].append(foos[1:])
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tm.assert_index_equal(result, ci, exact=True)
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def test_append_empty(self, ci):
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# empty
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result = ci.append([])
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tm.assert_index_equal(result, ci, exact=True)
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def test_append_mismatched_categories(self, ci):
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# appending with different categories or reordered is not ok
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msg = "all inputs must be Index"
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with pytest.raises(TypeError, match=msg):
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ci.append(ci.values.set_categories(list("abcd")))
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with pytest.raises(TypeError, match=msg):
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ci.append(ci.values.reorder_categories(list("abc")))
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def test_append_category_objects(self, ci):
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# with objects
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result = ci.append(Index(["c", "a"]))
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expected = CategoricalIndex(list("aabbcaca"), categories=ci.categories)
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tm.assert_index_equal(result, expected, exact=True)
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def test_append_non_categories(self, ci):
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# invalid objects -> cast to object via concat_compat
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result = ci.append(Index(["a", "d"]))
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expected = Index(["a", "a", "b", "b", "c", "a", "a", "d"])
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tm.assert_index_equal(result, expected, exact=True)
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def test_append_object(self, ci):
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# GH#14298 - if base object is not categorical -> coerce to object
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result = Index(["c", "a"]).append(ci)
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expected = Index(list("caaabbca"))
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tm.assert_index_equal(result, expected, exact=True)
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def test_append_to_another(self):
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# hits Index._concat
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fst = Index(["a", "b"])
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snd = CategoricalIndex(["d", "e"])
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result = fst.append(snd)
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expected = Index(["a", "b", "d", "e"])
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tm.assert_index_equal(result, expected)
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