code: def test_get_column() -> None:
      df = pl.DataFrame({"a": [1, 2], "b": [3, 4]})
      dfi = PolarsDataFrame(df)
  
      out = dfi.get_column(1)
  
      expected = pl.Series("b", [3, 4])
      assert_series_equal(out._col, expected)
  
imports: from __future__ import annotations
  import pytest
  import polars
  from polars.interchange.dataframe import PolarsDataFrame
  from polars.interchange.protocol import CopyNotAllowedError
  from polars.testing import assert_frame_equal, assert_series_equal
label_desc: Use image node_id 8 for calling a global function with example usage: test_get_column() without return types