code: def test_get_set_parallelism(self):
      self.execution_config.set_parallelism(8)
  
      self.assertEqual(self.execution_config.get_parallelism(), 8)
  
      self.execution_config.set_parallelism(4)
  
      self.assertEqual(self.execution_config.get_parallelism(), 4)
  
imports: from pyflink.datastream import StreamExecutionEnvironment
  from pyflink.common import ExecutionConfig, RestartStrategies, ExecutionMode, Configuration
  from pyflink.java_gateway import get_gateway
  from pyflink.testing.test_case_utils import PyFlinkTestCase
  from pyflink.util.java_utils import get_j_env_configuration
label_desc: Use image node_id 5 for calling the ExecutionConfigTests obj's underlying member method code with example usage: obj.test_get_set_parallelism() without return types