code: def test_arr_sum() -> None:
      s = pl.Series("a", [[1, 2], [4, 3]], dtype=pl.Array(pl.Int64, 2))
      assert s.arr.sum().to_list() == [3, 7]
  
file_path: polars/py-polars/tests/unit/namespaces/array/test_array.py
imports: import numpy
  import pytest
  import polars
  from polars import ComputeError
  from polars.testing import assert_frame_equal, assert_series_equal
label_desc: Use image node_id 3 for calling a global function with example usage: test_arr_sum() without return types