code: def getexplanation(self):
      expl = getattr(self, "reason", None) or self.get("reason", None)
      if not expl:
          if not hasattr(self, "expr"):
              return ""
          else:
              return "condition: " + str(self.expr)
      return expl
  
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 10 for calling the MarkEvaluator obj's underlying member method code with example usage: obj.getexplanation() and returns: expl, str, unknown