code: def difference_update(self, values):
          '''Remove an iterable of *values* from the set.'''
          d = self.value_pickler.dumps
          return self.cache.remove(tuple((d(v) for v in values))f difference_update(self, values):
          '''Remove an iterable of *values* from the set.'''
          d = self.value_pickler.dumps
          return self.cache.remove(tuple((d(v) for v in values)))
docs: Remove an iterable of *values* from the set.