code: def __str__(self):
      if self.stacktrace:
          return self.stacktrace
      else:
          return "[no stacktrace]\n%s: %s" % (self.type, self.exception)
  
imports: import sys
  import traceback
label_desc: Use image node_id 6 for calling the MetaflowExceptionWrapper obj's underlying member method code with example usage: obj.__str__() and returns: self, unknown