AWS Lambda: Python logging

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Log to local Python interpreter when test locally

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logging.basicConfig(level=logging.INFO)
logger = logging.getLogger()
logger.info('some log)

But this will not log to Cloud Watch when test on the cloud.

Log to Cloud Watch

AWS Lambda Python runtime has pre-configured log handlers. To log to Cloud Watch:

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logger = logging.getLogger()
logger.setLevel(logging.INFO)
logger.info('some log)

But this will not log to local Python interpreter when test locally.

Log to both Cloud Watch and local

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# If there is no pre-configured log handler, we set basicConfig
if not logging.getLogger().hasHandlers():
  logging.basicConfig(level=logging.INFO)

logger = logging.getLogger()
logger.setLevel(logging.INFO)