code: def test_dict_1(self):
      sf = tc.SFrame(
          {
              "dict1": [
                  {"1": 1, "2": 3.2},
                  {
                      "1": 3.1,
                  },
                  {"1": 1, "b": 2},
                  {"1": 1, "b": 3},
                  {"a": 2, "b": 3},
              ]
              * 100
          }
      )
      self._run_test(sf, 4)
  
imports: from __future__ import print_function
  from __future__ import division
  from __future__ import absolute_import
  import unittest
  import turicreate
  import math
  import uuid
  import random
  import copy
  from turicreate.toolkits import evaluation
  from turicreate.toolkits._main import ToolkitError
  import shutil
  import numpy
  from array import array
label_desc: Use image node_id 4 for calling the TreeExtractFeaturesTest obj's underlying member method code with example usage: obj.test_dict_1() without return types