code: def difference_update(self, *others):
          
          return self._op_update_helper(
              tuple(others), operator.sub, 'sdiffstore', update=True
          )
docs: Update the set, removing elements found in *others*.
  
          :param others: Iterables, each one as a single positional argument.
          :rtype: None
  
          .. note::
              The same behavior as at :func:`update` applies.