class_docstr: Usage information (for a given account, model group, and granularity).
code: def update_period(self, period: str):
      if self.period != period:
          self.period = period
          self.used = 0
  
imports: import copy
  import datetime
  import random
  import string
  from typing import Dict, Optional, Callable, List
  from dacite import from_dict
  from dataclasses import asdict, dataclass, field
  from sqlitedict import SqliteDict
  from helm.common.authentication import Authentication
  from helm.common.general import hlog
label_desc: Use image node_id 1 for calling the Usage obj's underlying member method code with example usage: obj.update_period(period) without return types