code: def __bool__(self):
      # dont cache here to prevent staleness
      return bool(self._get_marks())
  
imports: import os
  import platform
  import sys
  import traceback
  import six
  from ..outcomes import fail
  from ..outcomes import TEST_OUTCOME
label_desc: Use image node_id 2 for calling the MarkEvaluator obj's underlying member method code with example usage: obj.__bool__() and returns: bool