class_docstr: Class that implements a cache for JumpStart models manifests and specs.
  
  The manifest and specs associated with JumpStart models provide the information necessary
  for launching JumpStart models from the SageMaker SDK.
docstr: Returns json file from s3, along with its etag.
docstr_tok: ["Returns","json","file","from","s3",",","along","with","its","etag","."]
code: def _get_json_file_and_etag_from_s3(
      self, key: str
  ) -> Tuple[Union[dict, list], str]:
      """Returns json file from s3, along with its etag."""
      response = self._s3_client.get_object(
          Bucket=self.s3_bucket_name, Key=key
      )
      return (
          json.loads(response["Body"].read().decode("utf-8")),
          response["ETag"],
      )
  
imports: from __future__ import absolute_import
  import datetime
  from difflib import get_close_matches
  import os
  from typing import List, Optional, Tuple, Union
  import json
  import boto3
  import botocore
  from packaging.version import Version
  from packaging.specifiers import SpecifierSet, InvalidSpecifier
  from sagemaker.jumpstart.constants import ENV_VARIABLE_JUMPSTART_MANIFEST_LOCAL_ROOT_DIR_OVERRIDE, ENV_VARIABLE_JUMPSTART_SPECS_LOCAL_ROOT_DIR_OVERRIDE, JUMPSTART_DEFAULT_MANIFEST_FILE_S3_KEY, JUMPSTART_DEFAULT_REGION_NAME, JUMPSTART_LOGGER, MODEL_ID_LIST_WEB_URL
  from sagemaker.jumpstart.exceptions import get_wildcard_model_version_msg
  from sagemaker.jumpstart.parameters import JUMPSTART_DEFAULT_MAX_S3_CACHE_ITEMS, JUMPSTART_DEFAULT_MAX_SEMANTIC_VERSION_CACHE_ITEMS, JUMPSTART_DEFAULT_S3_CACHE_EXPIRATION_HORIZON, JUMPSTART_DEFAULT_SEMANTIC_VERSION_CACHE_EXPIRATION_HORIZON
  from sagemaker.jumpstart.types import JumpStartCachedS3ContentKey, JumpStartCachedS3ContentValue, JumpStartModelHeader, JumpStartModelSpecs, JumpStartS3FileType, JumpStartVersionedModelId
  from sagemaker.jumpstart import utils
  from sagemaker.utilities.cache import LRUCache
label_desc: Use image node_id 9 for calling the JumpStartModelsCache obj's underlying member method code with example usage: obj._get_json_file_and_etag_from_s3(key) and returns: json,  response