Simple example of envattrs for aws lambda function

example_envattrs.py

# echo '{}' > event.json; mkdir -p libs; pip install attrs envattrs -t libs; \
# export YOUR_PREFIX_SLACK_CHANNEL=your_project-staging; \
# export YOUR_PREFIX_S3_BUCKET=pyconapac-bucket; \
# export YOUR_PREFIX_THRESHOLD=50; \
# python-lambda-local -l libs/ -f handler -t 5 lambda_pyconapac.py event.json

from typing import Dict

import attr
import envattrs

@attr.s
class LambdaConfig:
    slack_channel = attr.ib(convert=str)
    s3_bucket     = attr.ib(convert=str)
    threshold     = attr.ib(convert=int)

def handler(event: Dict, context: Dict):
    lambda_config = envattrs.load(LambdaConfig, 'YOUR_PREFIX')
    
    print(f"{lambda_config.__dict__}")
    print(f">>> LambdaConfig.slack_channel: {LambdaConfig.slack_channel}")
    print(f">>> LambdaConfig.s3_bucket: {LambdaConfig.s3_bucket}")
    print(f">>> LambdaConfig.threshold: {LambdaConfig.threshold}")
    
    return lambda_config.__dict__