code: def test_string_slice_out_of_bounds(any_string_dtype):
      ser = Series(["foo", "b", "ba"], dtype=any_string_dtype)
      result = ser.str[1]
      expected = Series(["o", np.nan, "a"], dtype=any_string_dtype)
      tm.assert_series_equal(result, expected)
  
imports: from datetime import datetime, timedelta
  import numpy
  import pytest
  from pandas import DataFrame, Index, MultiIndex, Series
  import pandas._testing
  from pandas.core.strings.accessor import StringMethods
  from pandas.tests.strings import object_pyarrow_numpy
label_desc: Use image node_id 31 for calling a global function with example usage: test_string_slice_out_of_bounds(any_string_dtype) without return types