code: def testPackWithCustomTypeUrl(self):
      submessage = any_test_pb2.TestAny()
      submessage.int_value = 12345
      msg = any_pb2.Any()
      # Pack with a custom type URL prefix.
      msg.Pack(submessage, "type.myservice.com")
      self.assertEqual(
          msg.type_url,
          "type.myservice.com/%s" % submessage.DESCRIPTOR.full_name,
      )
      # Pack with a custom type URL prefix ending with '/'.
      msg.Pack(submessage, "type.myservice.com/")
      self.assertEqual(
          msg.type_url,
          "type.myservice.com/%s" % submessage.DESCRIPTOR.full_name,
      )
      # Pack with an empty type URL prefix.
      msg.Pack(submessage, "")
      self.assertEqual(
          msg.type_url, "/%s" % submessage.DESCRIPTOR.full_name
      )
      # Test unpacking the type.
      unpacked_message = any_test_pb2.TestAny()
      self.assertTrue(msg.Unpack(unpacked_message))
      self.assertEqual(submessage, unpacked_message)
  
imports: from datetime import datetime
  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 unittest_pb2
  from google.protobuf.internal import any_test_pb2
  from google.protobuf.internal import test_util
  from google.protobuf.internal import well_known_types
  from google.protobuf import descriptor
  from google.protobuf import text_format
label_desc: Use image node_id 3 for calling the AnyTest obj's underlying member method code with example usage: obj.testPackWithCustomTypeUrl() without return types