"""
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Tests for ndarray-like method on the base Index class
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"""
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import numpy as np
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import pytest
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from pandas import Index
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import pandas._testing as tm
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class TestReshape:
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def test_repeat(self):
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repeats = 2
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index = Index([1, 2, 3])
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expected = Index([1, 1, 2, 2, 3, 3])
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result = index.repeat(repeats)
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tm.assert_index_equal(result, expected)
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def test_insert(self):
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# GH 7256
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# validate neg/pos inserts
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result = Index(["b", "c", "d"])
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# test 0th element
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tm.assert_index_equal(Index(["a", "b", "c", "d"]), result.insert(0, "a"))
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# test Nth element that follows Python list behavior
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tm.assert_index_equal(Index(["b", "c", "e", "d"]), result.insert(-1, "e"))
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# test loc +/- neq (0, -1)
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tm.assert_index_equal(result.insert(1, "z"), result.insert(-2, "z"))
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# test empty
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null_index = Index([])
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tm.assert_index_equal(Index(["a"]), null_index.insert(0, "a"))
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def test_insert_missing(self, nulls_fixture):
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# GH#22295
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# test there is no mangling of NA values
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expected = Index(["a", nulls_fixture, "b", "c"])
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result = Index(list("abc")).insert(1, nulls_fixture)
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tm.assert_index_equal(result, expected)
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@pytest.mark.parametrize(
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"val", [(1, 2), np.datetime64("2019-12-31"), np.timedelta64(1, "D")]
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)
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@pytest.mark.parametrize("loc", [-1, 2])
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def test_insert_datetime_into_object(self, loc, val):
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# GH#44509
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idx = Index(["1", "2", "3"])
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result = idx.insert(loc, val)
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expected = Index(["1", "2", val, "3"])
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tm.assert_index_equal(result, expected)
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assert type(expected[2]) is type(val)
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@pytest.mark.parametrize(
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"pos,expected",
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[
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(0, Index(["b", "c", "d"], name="index")),
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(-1, Index(["a", "b", "c"], name="index")),
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],
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)
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def test_delete(self, pos, expected):
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index = Index(["a", "b", "c", "d"], name="index")
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result = index.delete(pos)
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tm.assert_index_equal(result, expected)
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assert result.name == expected.name
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def test_delete_raises(self):
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index = Index(["a", "b", "c", "d"], name="index")
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msg = "index 5 is out of bounds for axis 0 with size 4"
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with pytest.raises(IndexError, match=msg):
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index.delete(5)
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def test_append_multiple(self):
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index = Index(["a", "b", "c", "d", "e", "f"])
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foos = [index[:2], index[2:4], index[4:]]
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result = foos[0].append(foos[1:])
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tm.assert_index_equal(result, index)
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# empty
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result = index.append([])
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tm.assert_index_equal(result, index)
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