code: def test_simple_first(self):
      a = {
          "a": 1,
          "c": 5,
          "jack": "jill",
          "pick": "axe",
          "array": [1, 5, 6, 9],
          "tuple": (83, 12, 3),
          "crate": "dog",
          "zeak": "oh",
      }
      self.assertEqual(
          '{"a": 1, "c": 5, "crate": "dog", "jack": "jill", "pick": "axe", "zeak": "oh", "array": [1, 5, 6, 9], "tuple": [83, 12, 3]}',
          json.dumps(a, item_sort_key=json.simple_first),
      )
  
file_path: catboost/contrib/python/simplejson/py2/simplejson/tests/test_item_sort_key.py
imports: from unittest import TestCase
  import simplejson
  from operator import itemgetter
label_desc: Use image node_id 1 for calling the TestItemSortKey obj's underlying member method code with example usage: obj.test_simple_first() without return types