import pytest from pandas import ( Index, NaT, Series, ) import pandas._testing as tm def test_astype_str_from_bytes(): # https://github.com/pandas-dev/pandas/issues/38607 # GH#49658 pre-2.0 Index called .values.astype(str) here, which effectively # did a .decode() on the bytes object. In 2.0 we go through # ensure_string_array which does f"{val}" idx = Index(["あ", b"a"], dtype="object") result = idx.astype(str) expected = Index(["あ", "a"], dtype="object") tm.assert_index_equal(result, expected) # while we're here, check that Series.astype behaves the same result = Series(idx).astype(str) expected = Series(expected) tm.assert_series_equal(result, expected) def test_astype_invalid_nas_to_tdt64_raises(): # GH#45722 don't cast np.datetime64 NaTs to timedelta64 NaT idx = Index([NaT.asm8] * 2, dtype=object) msg = r"Invalid type for timedelta scalar: " with pytest.raises(TypeError, match=msg): idx.astype("m8[ns]")