Consistent region configuration

Always maintain consistency in region configurations throughout your application. Instead of hardcoding endpoints, use proper region configuration which allows for better maintainability and fewer errors. When working with region-dependent services like S3, ensure your client configuration region matches the service requirements.

For example, when creating S3 buckets:

# Good practice: Configure region once and use it consistently
region_name = 'us-west-2'
s3_client = boto3.client('s3', region_name=region_name)

# When creating a bucket, use the same region in LocationConstraint
s3_client.create_bucket(
    Bucket=bucket_name,
    CreateBucketConfiguration={'LocationConstraint': region_name}
)

Remember that configuration sources have precedence - programmatic configurations (like client parameters) will override environment variables and config files. When multiple configuration sources exist, be explicit about which one takes precedence to avoid unexpected behavior.