14. Handling Errors Without Leaking Data

Show clear messages to users without exposing system details. Log full errors for developers safely.

Example

import logging
logging.basicConfig(filename="app.log", level=logging.ERROR)

def load_config():
    try:
        with open("config.yaml") as f:
            return f.read()
    except FileNotFoundError:
        print("Configuration file missing.")
        logging.exception("Missing configuration file.")

✅ Lesson: Show user-friendly messages but log technical details privately.