{"library":"mypy-boto3-emr","title":"Type annotations for boto3 EMR","description":"mypy-boto3-emr provides high-quality type annotations for the AWS boto3 EMR (Elastic MapReduce) service. It allows developers to leverage static type checking with tools like MyPy, improving code reliability and developer experience when working with boto3. The library is currently at version 1.42.77 and is part of the `youtype/mypy_boto3_builder` project, which generates new stub packages frequently, typically aligning with boto3/botocore releases.","language":"python","status":"active","last_verified":"Thu May 14","install":{"commands":["pip install mypy-boto3-emr","pip install boto3 mypy"],"cli":null},"imports":["from mypy_boto3_emr.client import EMRClient","from mypy_boto3_emr.type_defs import ListClustersOutputTypeDef"],"auth":{"required":false,"env_vars":[]},"quickstart":{"code":"import boto3\nfrom typing import TYPE_CHECKING, List, Dict, Any\nimport os\n\n# Conditional import for type checking only\nif TYPE_CHECKING:\n    from mypy_boto3_emr.client import EMRClient\n    from mypy_boto3_emr.type_defs import ListClustersOutputTypeDef, ClusterSummaryTypeDef\n\n# Example function using type hints\ndef get_running_emr_clusters() -> List[ClusterSummaryTypeDef]:\n    # The client variable is explicitly typed for MyPy\n    client: EMRClient = boto3.client(\n        \"emr\",\n        region_name=os.environ.get('AWS_REGION', 'us-east-1'),\n        aws_access_key_id=os.environ.get('AWS_ACCESS_KEY_ID', 'DUMMY_KEY'),\n        aws_secret_access_key=os.environ.get('AWS_SECRET_ACCESS_KEY', 'DUMMY_SECRET')\n    )\n\n    # The response variable is explicitly typed\n    response: ListClustersOutputTypeDef = client.list_clusters(ClusterStates=['RUNNING'])\n\n    clusters: List[ClusterSummaryTypeDef] = response.get('Clusters', [])\n    print(f\"Found {len(clusters)} running EMR clusters.\")\n    for cluster in clusters:\n        print(f\"  - Cluster ID: {cluster['Id']}, Name: {cluster['Name']}\")\n    return clusters\n\nif __name__ == \"__main__\":\n    # This code will run, but type hints are only checked by MyPy\n    get_running_emr_clusters()\n","lang":"python","description":"This quickstart demonstrates how to use `mypy-boto3-emr` to add type hints to your boto3 EMR client and API responses. The `TYPE_CHECKING` block ensures that stub imports are only processed by the type checker, avoiding runtime import errors if the stubs are not installed. 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