"""
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Tests that can be parametrized over _any_ Index object.
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"""
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import re
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import numpy as np
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import pytest
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from pandas.errors import InvalidIndexError
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import pandas._testing as tm
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def test_boolean_context_compat(index):
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# GH#7897
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with pytest.raises(ValueError, match="The truth value of a"):
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if index:
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pass
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with pytest.raises(ValueError, match="The truth value of a"):
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bool(index)
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def test_sort(index):
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msg = "cannot sort an Index object in-place, use sort_values instead"
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with pytest.raises(TypeError, match=msg):
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index.sort()
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def test_hash_error(index):
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with pytest.raises(TypeError, match=f"unhashable type: '{type(index).__name__}'"):
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hash(index)
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def test_mutability(index):
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if not len(index):
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return
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msg = "Index does not support mutable operations"
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with pytest.raises(TypeError, match=msg):
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index[0] = index[0]
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def test_map_identity_mapping(index, request):
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# GH#12766
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result = index.map(lambda x: x)
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if index.dtype == object and result.dtype == bool:
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assert (index == result).all()
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# TODO: could work that into the 'exact="equiv"'?
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return # FIXME: doesn't belong in this file anymore!
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tm.assert_index_equal(result, index, exact="equiv")
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def test_wrong_number_names(index):
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names = index.nlevels * ["apple", "banana", "carrot"]
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with pytest.raises(ValueError, match="^Length"):
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index.names = names
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def test_view_preserves_name(index):
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assert index.view().name == index.name
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def test_ravel(index):
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# GH#19956 ravel returning ndarray is deprecated, in 2.0 returns a view on self
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res = index.ravel()
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tm.assert_index_equal(res, index)
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class TestConversion:
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def test_to_series(self, index):
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# assert that we are creating a copy of the index
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ser = index.to_series()
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assert ser.values is not index.values
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assert ser.index is not index
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assert ser.name == index.name
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def test_to_series_with_arguments(self, index):
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# GH#18699
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# index kwarg
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ser = index.to_series(index=index)
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assert ser.values is not index.values
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assert ser.index is index
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assert ser.name == index.name
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# name kwarg
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ser = index.to_series(name="__test")
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assert ser.values is not index.values
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assert ser.index is not index
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assert ser.name != index.name
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def test_tolist_matches_list(self, index):
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assert index.tolist() == list(index)
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class TestRoundTrips:
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def test_pickle_roundtrip(self, index):
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result = tm.round_trip_pickle(index)
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tm.assert_index_equal(result, index, exact=True)
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if result.nlevels > 1:
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# GH#8367 round-trip with timezone
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assert index.equal_levels(result)
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def test_pickle_preserves_name(self, index):
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original_name, index.name = index.name, "foo"
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unpickled = tm.round_trip_pickle(index)
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assert index.equals(unpickled)
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index.name = original_name
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class TestIndexing:
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def test_get_loc_listlike_raises_invalid_index_error(self, index):
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# and never TypeError
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key = np.array([0, 1], dtype=np.intp)
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with pytest.raises(InvalidIndexError, match=r"\[0 1\]"):
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index.get_loc(key)
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with pytest.raises(InvalidIndexError, match=r"\[False True\]"):
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index.get_loc(key.astype(bool))
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def test_getitem_ellipsis(self, index):
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# GH#21282
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result = index[...]
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assert result.equals(index)
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assert result is not index
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def test_slice_keeps_name(self, index):
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assert index.name == index[1:].name
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@pytest.mark.parametrize("item", [101, "no_int", 2.5])
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def test_getitem_error(self, index, item):
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msg = "|".join(
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[
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r"index 101 is out of bounds for axis 0 with size [\d]+",
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re.escape(
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"only integers, slices (`:`), ellipsis (`...`), "
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"numpy.newaxis (`None`) and integer or boolean arrays "
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"are valid indices"
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),
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"index out of bounds", # string[pyarrow]
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]
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)
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with pytest.raises(IndexError, match=msg):
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index[item]
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class TestRendering:
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def test_str(self, index):
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# test the string repr
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index.name = "foo"
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assert "'foo'" in str(index)
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assert type(index).__name__ in str(index)
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class TestReductions:
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def test_argmax_axis_invalid(self, index):
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# GH#23081
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msg = r"`axis` must be fewer than the number of dimensions \(1\)"
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with pytest.raises(ValueError, match=msg):
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index.argmax(axis=1)
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with pytest.raises(ValueError, match=msg):
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index.argmin(axis=2)
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with pytest.raises(ValueError, match=msg):
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index.min(axis=-2)
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with pytest.raises(ValueError, match=msg):
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index.max(axis=-3)
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