code: def add_command(self, cmd):
      self.commands.append(cmd)
  
imports: import datetime
  import os
  import signal
  import sys
  import time
  import traceback
  from subprocess import call
  from .argparse_hopt import HyperOptArgumentParser
label_desc: Use image node_id 7 for calling the AbstractCluster obj's underlying member method code with example usage: obj.add_command(cmd) without return types