code: def put_ops(self, key, time, ops):
          ''' Put an ops only if not already there, otherwise it's a no op.
          '''
          if self._store.get(key) is None:
              self._store[key] = opf put_ops(self, key, time, ops):
          ''' Put an ops only if not already there, otherwise it's a no op.
          '''
          if self._store.get(key) is None:
              self._store[key] = ops
docs: Put an ops only if not already there, otherwise it's a no op.