Exceptions represent exceptional paths
Exceptions allow Python code to separate normal processing from failure handling. A risky operation goes inside try, while specific recoverable failures are handled by matching except blocks.
Use the complete try statement
else runs when the protected operation succeeds and finally runs regardless of success or failure. This makes it possible to keep success logic and cleanup logic separate.
Catch what you can actually handle
A broad exception handler can hide programming errors. Catch specific exceptions, add useful context and let failures propagate when the current layer has no sensible recovery action.
Practice: write an integer parser that handles invalid text cleanly and lets the caller decide how to present the error.
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