code: def df():
      return DataFrame(
          {
              "A": [
                  "foo",
                  "bar",
                  "foo",
                  "bar",
                  "foo",
                  "bar",
                  "foo",
                  "foo",
              ],
              "B": [
                  "one",
                  "one",
                  "two",
                  "three",
                  "two",
                  "two",
                  "one",
                  "three",
              ],
              "C": np.random.default_rng(2).standard_normal(8),
              "D": np.random.default_rng(2).standard_normal(8),
          }
      )
  
file_path: pandas/pandas/tests/groupby/conftest.py
imports: import numpy
  import pytest
  from pandas import DataFrame, Index, Series, date_range
  from pandas.core.groupby.base import reduction_kernels, transformation_kernels
label_desc: Use image node_id 1 for calling a global function with example usage: df() and returns: DataFrame