annotationsとTYPE_CHECKINGでPython Lambdaにおいてboto3-stubsをデプロイパッケージに含めずに使う

from __future__ import annotations

import json
from typing import TYPE_CHECKING

import boto3

if TYPE_CHECKING:
    from mypy_boto3_sts import STSClient

sts: STSClient = boto3.client("sts")

def lambda_handler(event, context):
    resp = sts.get_caller_identity()
    print(
        json.dumps(
            resp,
            ensure_ascii=False,
            default=lambda x: {"type": str(type(x)), "value": str(x)},
        )
    )

from __future__ import annotations

if TYPE_CHECKING:
    from mypy_boto3_sts import STSClient