code: def test_iter_dataframe(self):
      pdf, psdf = self.df_pair
  
      for value_psdf, value_pdf in zip(psdf, pdf):
          self.assert_eq(value_psdf, value_pdf)
  
imports: import unittest
  import numpy
  import pandas
  from pyspark import pandas
  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 16 for calling the FrameIndexingMixin obj's underlying member method code with example usage: obj.test_iter_dataframe() without return types