def test_zero_length_input_index(self, sort):
# GH 24966 test for 0-len intersections are copied
index_1 = timedelta_range("1 day", periods=0, freq="h")
index_2 = timedelta_range("1 day", periods=3, freq="h")
result = index_1.intersection(index_2, sort=sort)
assert index_1 is not result
assert index_2 is not result
tm.assert_copy(result, index_1)
def test_astype(idx):
expected = idx.copy()
actual = idx.astype("O")
tm.assert_copy(actual.levels, expected.levels)
tm.assert_copy(actual.codes, expected.codes)
assert actual.names == list(expected.names)
with pytest.raises(TypeError, match="^Setting.*dtype.*object"):
idx.astype(np.dtype(int))
def assert_multiindex_copied(copy, original):
# Levels should be (at least, shallow copied)
tm.assert_copy(copy.levels, original.levels)
tm.assert_almost_equal(copy.codes, original.codes)
# Labels doesn't matter which way copied
tm.assert_almost_equal(copy.codes, original.codes)
assert copy.codes is not original.codes
# Names doesn't matter which way copied
assert copy.names == original.names
assert copy.names is not original.names
# Sort order should be copied
assert copy.sortorder == original.sortorder
