mypy-boto3-emr

import boto3 from typing import TYPE_CHECKING, List, Dict, Any import os # Conditional import for type checking only if TYPE_CHECKING: from mypy_boto3_emr.client import EMRClient from mypy_boto3_emr.type_defs import ListClustersOutputTypeDef, ClusterSummaryTypeDef # Example function using type hints def get_running_emr_clusters() -> List[ClusterSummaryTypeDef]: # The client variable is explicitly typed for MyPy client: EMRClient = boto3.client( "emr", region_name=os.environ.get('AWS_REGION', 'us-east-1'), aws_access_key_id=os.environ.get('AWS_ACCESS_KEY_ID', 'DUMMY_KEY'), aws_secret_access_key=os.environ.get('AWS_SECRET_ACCESS_KEY', 'DUMMY_SECRET') ) # The response variable is explicitly typed response: ListClustersOutputTypeDef = client.list_clusters(ClusterStates=['RUNNING']) clusters: List[ClusterSummaryTypeDef] = response.get('Clusters', []) print(f"Found {len(clusters)} running EMR clusters.") for cluster in clusters: print(f" - Cluster ID: {cluster['Id']}, Name: {cluster['Name']}") return clusters if __name__ == "__main__": # This code will run, but type hints are only checked by MyPy get_running_emr_clusters()