code: def pdf(self):
      return pd.DataFrame(
          {
              "A": [1, 2, 1, 2],
              "B": [3.1, 4.1, 4.1, 3.1],
              "C": ["a", "b", "b", "a"],
              "D": [True, False, False, True],
          }
      )
  
file_path: spark/python/pyspark/pandas/tests/groupby/test_stat_prod.py
imports: import unittest
  import numpy
  import pandas
  from pyspark import pandas
  from pyspark.testing.pandasutils import PandasOnSparkTestCase
  from pyspark.pandas.tests.groupby.test_stat import GroupbyStatTestingFuncMixin
label_desc: Use image node_id 1 for calling the ProdTestsMixin obj's underlying member method code with example usage: obj.pdf() and returns: pd