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Errors and Robustness: Python: Uncharted

Courses PythonErrors and Robustness

Errors and Robustness

Read tracebacks as evidence, raise and catch precise exceptions, validate inputs defensively, and debug methodically until fixes survive meaningful checks.

Python
Unit 15 of 20
20 lessons
180 min
420 XP

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Lessons

20 total

1Errors Are InformationDecode the error type, message, location, and call trail in a Python traceback.InteractiveConcept7 min20 XPOpen
2Read the Traceback UpwardUse the bottom-line TypeError and its source location to repair the guilty expression.CodeConcept8 min20 XPOpen
3Error Field GuideRepair a TypeError, KeyError, and IndexError by reading the operation that raised each one.CodeConcept9 min20 XPOpen
4Raise Your OwnReject a non-positive amount with a precise, helpful ValueError.CodeConcept8 min20 XPOpen
5try and exceptCatch invalid integer text, report it, and continue processing later values.CodeConcept9 min20 XPOpen
6Catch the Right OneCatch invalid numeric text without hiding unrelated TypeErrors.CodeConcept8 min20 XPOpen
7else and finallySeparate rejected, successful, and always-run cleanup paths in one try statement.CodeConcept9 min20 XPOpen
8Which Line Raises?Predict the exact expression that raises before running a short program.InteractiveConcept8 min20 XPOpen
9Guard the GatesValidate a score collection early and raise precise exceptions before calculation.CodeConcept8 min20 XPOpen
10Ask ForgivenessUse EAFP dictionary access with a precise KeyError fallback.CodeConcept9 min20 XPOpen
11Messages That HelpTurn vague port-validation failures into actionable ValueError messages.CodeConcept9 min20 XPOpen
12Debugging Is a MethodOrder a disciplined debugging cycle from reproduction through verification.InteractiveConcept8 min20 XPOpen
13Prints with LabelsUse labeled intermediate values to find and repair a discount calculation bug.CodeConcept9 min20 XPOpen
14Bug Hunt OneUse behavioral checks to repair three independent score-summary logic bugs.CodePractice11 min20 XPOpen
15Unbreakable Tip CalculatorConvert diner input, validate its range, and raise actionable errors for garbage values.CodePractice12 min20 XPOpen
16Nested except PredictionsPredict how an unmatched inner exception propagates to an outer handler and finally.InteractiveConcept8 min20 XPOpen
17Defensive List UtilsReturn sensible fallbacks for missing list positions without hiding unrelated errors.CodePractice10 min20 XPOpen
18Fail Loud, Fail EarlyExplain why a precise early failure is safer than a plausible quiet wrong answer.InteractiveConcept9 min20 XPOpen
19Bug Hunt TwoRepair a plausible shipping quote whose express surcharge overwrites base shipping.CodePractice10 min20 XPOpen
20Errors Mastery CheckParse, validate, and calculate an order while translating only expected failures.CodeMastery check11 min40 XPOpen

Classes Iterators and Generators