class_docstr: Manages cached values for a single st.cache_data function.
class_docstr_tok: ["Manages","cached","values","for","a","single","st.cache_data","function","."]
docstr: Look up the results from storage and ensure it has the right type.
  
  Raises a `CacheKeyNotFoundError` if the key has no entry, or if the
  entry is malformed.
docstr_tok: ["Look","up","the","results","from","storage","and","ensure","it","has","the","right","type",".","Raises","a","`","CacheKeyNotFoundError","`","if","the","key","has","no","entry",",","or","if","the","entry","is","malformed","."]
code: def _read_multi_results_from_storage(
      self, key: str
  ) -> MultiCacheResults:
      """Look up the results from storage and ensure it has the right type.
  
      Raises a `CacheKeyNotFoundError` if the key has no entry, or if the
      entry is malformed.
      """
      try:
          pickled = self.storage.get(key)
      except CacheStorageKeyNotFoundError as e:
          raise CacheKeyNotFoundError(str(e)) from e
  
      maybe_results = pickle.loads(pickled)
  
      if isinstance(maybe_results, MultiCacheResults):
          return maybe_results
      else:
          self.storage.delete(key)
          raise CacheKeyNotFoundError()
  
imports: from __future__ import annotations
  import pickle
  import threading
  import types
  from datetime import timedelta
  from typing import Any, Callable, TypeVar, Union, cast, overload
  from typing_extensions import Literal, TypeAlias
  import streamlit
  from streamlit import runtime
  from streamlit.deprecation_util import show_deprecation_warning
  from streamlit.errors import StreamlitAPIException
  from streamlit.logger import get_logger
  from streamlit.runtime.caching.cache_errors import CacheError, CacheKeyNotFoundError
  from streamlit.runtime.caching.cache_type import CacheType
  from streamlit.runtime.caching.cache_utils import Cache, CachedFuncInfo, make_cached_func_wrapper, ttl_to_seconds
  from streamlit.runtime.caching.cached_message_replay import CachedMessageReplayContext, CachedResult, ElementMsgData, MsgData, MultiCacheResults
  from streamlit.runtime.caching.hashing import HashFuncsDict
  from streamlit.runtime.caching.storage import CacheStorage, CacheStorageContext, CacheStorageError, CacheStorageKeyNotFoundError, CacheStorageManager
  from streamlit.runtime.caching.storage.cache_storage_protocol import InvalidCacheStorageContext
  from streamlit.runtime.caching.storage.dummy_cache_storage import MemoryCacheStorageManager
  from streamlit.runtime.metrics_util import gather_metrics
  from streamlit.runtime.scriptrunner.script_run_context import get_script_run_ctx
  from streamlit.runtime.stats import CacheStat, CacheStatsProvider, group_stats
label_desc: Use image node_id 6 for calling the DataCache obj's underlying member method code with example usage: obj._read_multi_results_from_storage(key) and returns: maybe_results