code: def test_rolling_map_rolling_std() -> None:
      s = pl.Series("A", list(range(6)), dtype=pl.Float64)
  
      result = s.rolling_map(
          function=lambda s: s.std(),
          window_size=4,
          min_periods=3,
          center=False,
      )
  
      expected = s.rolling_std(
          window_size=4, min_periods=3, center=False
      )
      assert_series_equal(result, expected)
  
file_path: polars/py-polars/tests/unit/operations/rolling/test_map.py
imports: from __future__ import annotations
  import numpy
  import pytest
  import polars
  from polars.testing import assert_series_equal
label_desc: Use image node_id 9 for calling a global function with example usage: test_rolling_map_rolling_std() without return types