code: 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, dtype=object)
      tm.assert_series_equal(result, expected)
  
imports: import pytest
  from pandas import Index, NaT, Series
  import pandas._testing
label_desc: Use image node_id 1 for calling a global function with example usage: test_astype_str_from_bytes() without return types