code: def pdf(self):
      return pd.DataFrame(
          {
              "a": [1, 2, 3, 4, 5, 6, 7, 8, 9],
              "b": [4, 5, 6, 3, 2, 1, 0, 0, 0],
          },
          index=np.random.rand(9),
      )
  
imports: from datetime import datetime
  import sys
  import unittest
  from typing import List
  import numpy
  import pandas
  from pyspark import pandas
  from pyspark.loose_version import LooseVersion
  from pyspark.pandas.config import option_context
  from pyspark.testing.pandasutils import ComparisonTestBase
  from pyspark.testing.sqlutils import SQLTestUtils
label_desc: Use image node_id 1 for calling the FrameApplyFunctionMixin obj's underlying member method code with example usage: obj.pdf() and returns: pd