code: def testDuplicateField(self):
      # Duplicate key check is not supported for python2.6
      if sys.version_info < (2, 7):
          return
      self.CheckError(
          '{"int32Value": 1,\n"int32Value":2}',
          "Failed to load JSON: duplicate key int32Value.",
      )
  
imports: import json
  import math
  import sys
  from google.protobuf import any_pb2
  from google.protobuf import duration_pb2
  from google.protobuf import field_mask_pb2
  from google.protobuf import struct_pb2
  from google.protobuf import timestamp_pb2
  from google.protobuf import wrappers_pb2
  from google.protobuf.internal import well_known_types
  from google.protobuf import json_format
  from google.protobuf.util import json_format_proto3_pb2
label_desc: Use image node_id 25 for calling the JsonFormatTest obj's underlying member method code with example usage: obj.testDuplicateField() without return types