Type Annotations for boto3 IoTAnalytics

Warnings

• breaking Python 3.8 is no longer supported across `mypy-boto3` packages. Projects targeting Python 3.8 will need to upgrade to Python 3.9 or newer.
  Fix: Upgrade your Python environment to 3.9 or a later version.
• breaking The `mypy-boto3-builder` introduced breaking changes to `TypeDef` naming conventions (e.g., shorter names, postfix changes) in version 8.9.0. This can affect existing type annotations in your code if you explicitly reference `TypeDef` names.
  Fix: Review and update `TypeDef` import paths and names in your code according to the new conventions.
• gotcha The `mypy-boto3` ecosystem migrated to PEP 561 packages. This might impact how packages are installed or discovered, especially in custom build environments or older package managers.
  Fix: Ensure your package management and build tools correctly handle PEP 561-compliant stub packages. For issues, consider regenerating stubs with `mypy-boto3-builder` using `uvx` if applicable.
• gotcha PyCharm users might experience slow performance or high CPU usage due to how it handles `Literal` overloads in `mypy-boto3`.
  Fix: It is recommended to use `boto3-stubs-lite` (if appropriate for your use case) or to disable PyCharm's built-in type checker and rely on `mypy` or `pyright` instead.
• gotcha While `mypy-boto3` aims for auto-discovery, explicit type annotations for `boto3.client()` and `boto3.resource()` calls are often necessary or recommended for full IDE auto-completion and static analysis support, especially in VSCode.
  Fix: Always add an explicit type hint to your `boto3.client()` or `boto3.resource()` assignments, for example: `client: IoTAnalyticsClient = boto3.client('iotanalytics')`.

Install

• pip install mypy-boto3-iotanalytics boto3 mypy Install library, boto3, and mypy

Imports

• IoTAnalyticsClient

  from mypy_boto3_iotanalytics import IoTAnalyticsClient

• ListChannelsResponseTypeDef

  from mypy_boto3_iotanalytics.type_defs import ListChannelsResponseTypeDef

• boto3.client('iotanalytics')

  client: IoTAnalyticsClient = boto3.client('iotanalytics')

  While `mypy-boto3` often enables auto-discovery, explicit type annotations for `boto3.client()` calls are recommended for full IDE support and robust static analysis, especially in VSCode or with specific `mypy` configurations.

Quickstart

Demonstrates how to initialize an `IoTAnalyticsClient` with type hints and perform a simple operation like listing channels. Ensure `boto3` is installed and AWS credentials are configured in your environment.

import os
import boto3
from typing import TYPE_CHECKING

if TYPE_CHECKING:
    from mypy_boto3_iotanalytics import IoTAnalyticsClient
    from mypy_boto3_iotanalytics.type_defs import ListChannelsResponseTypeDef

def list_iotanalytics_channels() -> "ListChannelsResponseTypeDef":
    """
    Lists IoTAnalytics channels with type hints.
    """
    # Ensure AWS credentials are configured (e.g., via environment variables or ~/.aws/credentials)
    # The 'region_name' can also be passed here, e.g., region_name=os.environ.get('AWS_REGION', 'us-east-1')
    client: "IoTAnalyticsClient" = boto3.client(
        "iotanalytics", 
        region_name=os.environ.get('AWS_REGION', 'us-east-1')
    )
    
    print("Listing IoTAnalytics channels...")
    response: "ListChannelsResponseTypeDef" = client.list_channels()
    
    for channel in response.get("channelSummaries", []):
        print(f"  Channel Name: {channel.get('channelName')}")
        print(f"  Creation Time: {channel.get('creationTime')}")
    
    return response

if __name__ == "__main__":
    try:
        # Example assumes AWS credentials are set up in the environment
        # e.g., AWS_ACCESS_KEY_ID, AWS_SECRET_ACCESS_KEY, AWS_REGION
        list_iotanalytics_channels()
    except Exception as e:
        print(f"An error occurred: {e}")