code: def _start_machine(machine, session):
      '''
      Helper to try and start machines
  
      @param machine:
      @type machine: IMachine
      @param session:
      @type session: ISession
      @return:
      @rtype: IProgress or None
      '''
      try:
          return machine.launchVMProcess(session, '', '')
      except Exception as e:
          log.debug(e.message, exc_info=True)
          return Nonf _start_machine(machine, session):
      '''
      Helper to try and start machines
  
      @param machine:
      @type machine: IMachine
      @param session:
      @type session: ISession
      @return:
      @rtype: IProgress or None
      '''
      try:
          return machine.launchVMProcess(session, '', '')
      except Exception as e:
          log.debug(e.message, exc_info=True)
          return None
docs: Helper to try and start machines
  
      @param machine:
      @type machine: IMachine
      @param session:
      @type session: ISession
      @return:
      @rtype: IProgress or None