lesson 2 of 3 · try/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misuseslesson 2 of 3 · try/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misuseslesson 2 of 3 · try/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misuseslesson 2 of 3 · try/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misuseslesson 2 of 3 · try/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misuseslesson 2 of 3 · try/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misuseslesson 2 of 3 · try/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misuseslesson 2 of 3 · try/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misuseslesson 2 of 3 · try/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misuseslesson 2 of 3 · try/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misuseslesson 2 of 3 · try/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misusestry/except — the patterns ai misuses
Checkpoint
One last thing before we move on. pass this to mark the lesson done, or skip and keep moving. hop to the next when you're ready.
Last drill. Cursor wrote summarize_order to look up an item's price,
multiply it by a quantity it parses from a string, and return a total.
Three failure modes:
prices[item]raisesKeyErrorif the item isn't in the catalog.int(qty_text)raisesValueErrorif the string isn't a number.- everything else (a real bug you didn't anticipate) should crash.
The starter has a single except Exception: that swallows all three.
The last order in the list is a real bug — the caller passed a list
instead of an item name, which raises TypeError. The test harness at
the bottom catches that and prints bug: crashed loudly so you can see
the bug escaping. Right now it prints invalid instead — the broad
except is hiding it.
Fix the except: catch KeyError and ValueError together with a
tuple, return "invalid" for either case, and let any other exception
fly through.
Expected output:
20
invalid
invalid
bug: crashed loudly