code: def a(df):
      return pd.concat([df, df])
  
file_path: pandas/pandas/tests/indexing/multiindex/test_indexing_slow.py
imports: import numpy
  import pytest
  import pandas
  from pandas import DataFrame, Series
  import pandas._testing
label_desc: Use image node_id 7 for calling a global function with example usage: a(df) and returns: pd