code: def register_meter(self, name: str, meter: Meter) -> None:
      if "_meters" not in self.__dict__:
          raise AttributeError(
              "cannot assign meter before MeterDict.__init__() call"
          )
      elif "/" in name:
          raise KeyError("meter name cannot contain '/'")
      elif name == "":
          raise KeyError("meter name cannot be empty")
      elif hasattr(self, name) and name not in self._meters:
          raise KeyError(f"attribute {name} already exists")
      self._meters[name] = meter
  
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 2 for calling the MeterDict obj's underlying member method code with example usage: obj.register_meter(name, meter) without return types