Logging is part of application observability
The logging module provides levels such as DEBUG, INFO, WARNING, ERROR and CRITICAL. Logging records events that can help developers understand what happened during development and production execution.
Choose the right level
INFO can describe normal important events, WARNING can describe unusual but recoverable situations, and ERROR can describe failures that require attention. DEBUG is useful for detailed diagnostics when enabled.
Never log secrets
Passwords, API keys, access tokens and other sensitive values should not appear in logs. Logs should provide context without becoming a second source of credential leakage.
Practice: add structured logging to an order-processing function and include useful identifiers without logging payment or authentication secrets.
ADVERTISEMENT