Check your understanding

Why does "5" + 5 fail, and what are two ways to fix it?
You committed but your friend can't see the change on GitHub. Why?
What's the difference between return and print inside a function?
When would you pick a set instead of a list?
What does totals.get(cat, 0) + amount do on the first expense of a new category?

Answers

You can't add a str and an int. Use int("5") + 5 → 10, or "5" + str(5) → "55".
You didn't git push. A commit is only local until you push it.
return hands a value back to the calling code, while print only shows text on the screen and gives back None.
When you need unique items or fast "is it in here?" checks, and you don't care about order.
The category isn't in totals yet, so .get returns 0 and the new total is simply the amount.

Now take the quiz. The pass mark is 7/10.

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Fix a real ticket in a small codebase you didn't write: read the code, change only the functions you're given, pass the tests, then submit for hidden checks and a score.

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