code: def test_select_none() -> None:
      result = pl.select(None)
      expected = pl.select(pl.lit(None))
      assert_frame_equal(result, expected)
  
file_path: polars/py-polars/tests/unit/operations/test_select.py
imports: import polars
  from polars.testing import assert_frame_equal
label_desc: Use image node_id 4 for calling a global function with example usage: test_select_none() without return types