code: def _istrue(self):
      if hasattr(self, "result"):
          return self.result
      self._marks = self._get_marks()
  
      if self._marks:
          self.result = False
          for mark in self._marks:
              self._mark = mark
              if "condition" in mark.kwargs:
                  args = (mark.kwargs["condition"],)
              else:
                  args = mark.args
  
              for expr in args:
                  self.expr = expr
                  if isinstance(expr, six.string_types):
                      d = self._getglobals()
                      result = cached_eval(self.item.config, expr, d)
                  else:
                      if "reason" not in mark.kwargs:
                          # XXX better be checked at collection time
                          msg = (
                              "you need to specify reason=STRING "
                              "when using booleans as conditions."
                          )
                          fail(msg)
                      result = bool(expr)
                  if result:
                      self.result = True
                      self.reason = mark.kwargs.get("reason", None)
                      self.expr = expr
                      return self.result
  
              if not args:
                  self.result = True
                  self.reason = mark.kwargs.get("reason", None)
                  return self.result
      return False
  
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 8 for calling the MarkEvaluator obj's underlying member method code with example usage: obj._istrue() and returns: False, self, self, self