code: def open(self):
      for operation in self._operations:
          operation.open()
  
file_path: flink/flink-python/pyflink/fn_execution/embedded/operations.py
imports: from pyflink.fn_execution.datastream.embedded.operations import extract_process_function
  from pyflink.fn_execution.embedded.converters import DataConverter
label_desc: Use image node_id 2 for calling the FunctionOperation obj's underlying member method code with example usage: obj.open() without return types