Advanced · 4 labs
Crash-Proof Sythra: Try / Except
Parse messy learner input and recover from errors with try and except — so Sythra never crashes on bad data.
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Safe XP Parser
XP fields sometimes arrive as invalid text from forms. Write safe_xp(text). Return int(text) on success. On ValueError return 0. Examples - safe_xp("42") → 42 - safe_xp("abc") → 0 - safe_xp("") → 0 - safe_xp("-5") → -5
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Missing Profile Field
Learner profiles may be missing optional fields. Write get_profile_field(profile, field). Return str(profile[field]) when present. On KeyError return "N/A". Examples - get_profile_field({"name": "Asha"}, "name") → "Asha" - get_profile_field({}, "level") → "N/A" - get_profile_field({"xp": 10}, "streak") → "N/A"
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Safe Accuracy Calculator
Quiz accuracy is correct divided by total, as a percent rounded to 1 decimal. Write safe_accuracy(correct, total). On success return round(correct / total * 100, 1). ZeroDivisionError (total is 0) → 0.0 TypeError (bad types for division) → None Use separate except blocks for ZeroDivisionError and TypeError. Examples - safe_accuracy(8, 10) → 80.0 - safe_accuracy(1, 3) → 33.3 - safe_accuracy(5, 0) → 0.0 - safe_accuracy("5", 10) → None
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Retry with else and finally
Sythra loads the first valid integer from a list of raw inputs and logs every attempt. Write load_first_valid(inputs, log). Try int() on each item in order. On success use else on the try block and return (value, tries) where tries is the 1-based attempt number. If no item converts, return (None, tries) where tries is how many you tried. Use finally to append the string checked to log on every attempt (success or failure). Examples - load_first_valid(["x", "2"], []) → (2, 2) and log ["checked", "checked"] - load_first_valid(["bad"], []) → (None, 1) and log ["checked"] - load_first_valid([], []) → (None, 0) and log []
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