code: def example_df() -> pl.DataFrame:
      return pl.DataFrame(
          {"i64": [1, 2], "f64": [0.1, 0.2], "str": ["a", "b"]}
      )
  
file_path: polars/py-polars/tests/unit/io/test_avro.py
imports: from __future__ import annotations
  import io
  from typing import TYPE_CHECKING
  import pytest
  import polars
  from polars.testing import assert_frame_equal
label_desc: Use image node_id 1 for calling a global function with example usage: example_df() and returns: pl