code: def discard(self, value):
          '''Remove an element *value* from a set if it is a member.'''
          return self.cache.remove((self.value_pickler.dumps(value),)f discard(self, value):
          '''Remove an element *value* from a set if it is a member.'''
          return self.cache.remove((self.value_pickler.dumps(value),))
docs: Remove an element *value* from a set if it is a member.