code: def exit_ok(self):
      return self.__retcode == 0
  
imports: import csv
  import os
  import shutil
  import subprocess
  import tempfile
  import unittest
  import matplotlib
  from six.moves import xrange
  from pyalgotrade import dataseries
label_desc: Use image node_id 2 for calling the RunResults obj's underlying member method code with example usage: obj.exit_ok() and returns: unknown