code: def init_boto(self) -> "boto3.resources.base.ServiceResource":
      if self._s3 is not None:
          return self._s3
      boto: boto3 = util.get_module(
          "boto3",
          required="s3:// references requires the boto3 library, run pip install wandb[aws]",
          lazy=False,
      )
      self._s3 = boto.session.Session().resource(
          "s3",
          endpoint_url=os.getenv("AWS_S3_ENDPOINT_URL"),
          region_name=os.getenv("AWS_REGION"),
      )
      self._botocore = util.get_module("botocore")
      return self._s3
  
imports: import os
  import time
  from pathlib import PurePosixPath
  from typing import TYPE_CHECKING, Dict, Optional, Sequence, Tuple, Union
  from urllib.parse import parse_qsl, urlparse
  from wandb import util
  from wandb.errors import CommError
  from wandb.errors.term import termlog
  from wandb.sdk.artifacts.artifact_file_cache import get_artifact_file_cache
  from wandb.sdk.artifacts.artifact_manifest_entry import ArtifactManifestEntry
  from wandb.sdk.artifacts.storage_handler import DEFAULT_MAX_OBJECTS, StorageHandler
  from wandb.sdk.lib.hashutil import ETag
  from wandb.sdk.lib.paths import FilePathStr, StrPath, URIStr
label_desc: Use image node_id 3 for calling the S3Handler obj's underlying member method code with example usage: obj.init_boto() and returns: self, self