import numpy as np
|
import pytest
|
|
from pandas import (
|
Index,
|
MultiIndex,
|
)
|
import pandas._testing as tm
|
|
|
class TestIndexConstructor:
|
# Tests for the Index constructor, specifically for cases that do
|
# not return a subclass
|
|
@pytest.mark.parametrize("value", [1, np.int64(1)])
|
def test_constructor_corner(self, value):
|
# corner case
|
msg = (
|
r"Index\(\.\.\.\) must be called with a collection of some "
|
f"kind, {value} was passed"
|
)
|
with pytest.raises(TypeError, match=msg):
|
Index(value)
|
|
@pytest.mark.parametrize("index_vals", [[("A", 1), "B"], ["B", ("A", 1)]])
|
def test_construction_list_mixed_tuples(self, index_vals):
|
# see gh-10697: if we are constructing from a mixed list of tuples,
|
# make sure that we are independent of the sorting order.
|
index = Index(index_vals)
|
assert isinstance(index, Index)
|
assert not isinstance(index, MultiIndex)
|
|
def test_constructor_cast(self):
|
msg = "could not convert string to float"
|
with pytest.raises(ValueError, match=msg):
|
Index(["a", "b", "c"], dtype=float)
|
|
@pytest.mark.parametrize("tuple_list", [[()], [(), ()]])
|
def test_construct_empty_tuples(self, tuple_list):
|
# GH #45608
|
result = Index(tuple_list)
|
expected = MultiIndex.from_tuples(tuple_list)
|
|
tm.assert_index_equal(result, expected)
|
