code: def clear_cache(cls, *, only_keys=None):
      if only_keys is not None:
          for key in only_keys:
              cls._weak_cache.pop(key, None)
              cls._strong_cache.pop(key, None)
  
      else:
          cls._weak_cache.clear()
          cls._strong_cache.clear()
  
imports: import bisect
  import calendar
  import collections
  import functools
  import re
  import weakref
  from datetime import datetime, timedelta, tzinfo
  from .None import _common, _tzpath
label_desc: Use image node_id 6 for calling the ZoneInfo obj's underlying member method code with example usage: obj.clear_cache(cls) without return types