code: def restart(self):
      for _, meter in self._named_meters():
          meter.restart()
  
imports: from __future__ import annotations
  import warnings
  import json
  from typing import Dict, Union, Optional
  from collections import OrderedDict
  from .meters import Meter
label_desc: Use image node_id 13 for calling the MeterDict obj's underlying member method code with example usage: obj.restart() without return types