code: def success( self ):
          
          if self.STATUS in self.metadata().keys():
              return (self.metadata())[self.STATUS]
          else:
              return False
docs: Test whether the experiment has been run successfully. This will
          be False if the experiment hasn't been run, or if it's been run and
          failed (in which case the exception will be stored in the metadata).
  
          :returns: ``True`` if the experiment has been run successfully