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: import contextlib
  import numpy
  import pandas
  from pyspark import pandas
  from pyspark.testing.pandasutils import assert_produces_warning, ComparisonTestBase
  from pyspark.pandas.extensions import register_dataframe_accessor, register_series_accessor, register_index_accessor
label_desc: Use image node_id 1 for calling the ExtensionTestsMixin obj's underlying member method code with example usage: obj.pdf() and returns: pd