code: def test_repr(df: pl.DataFrame) -> None:
      assert isinstance(repr(df), str)
  
file_path: polars/py-polars/tests/parametric/test_dataframe.py
imports: from __future__ import annotations
  from hypothesis import example, given, settings
  from hypothesis.strategies import integers
  import polars
  from polars.testing import assert_frame_equal
  from polars.testing.parametric import column, dataframes
label_desc: Use image node_id 1 for calling a global function with example usage: test_repr(df) without return types