Tuple unpacking

What this problem practises

Tuples are immutable containers that may themselves hold mutable objects, and it is the comma — not the parentheses — that builds one. Any unpacking where the counts disagree raises ValueError.

This is an output-prediction problem: read the snippet carefully and write down exactly what it prints before anything runs. These questions are interview staples because they test whether you know the language rules, or merely recognise their syntax.

Difficulty: easy — the fix or the trick is normally a single line, and a careful read should be enough.

The challenge

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Keep going

• Output-prediction strategies — how to predict tricky snippets without running them.
• Browse every tuples problem in this topic.
• Common Python errors and what they actually mean, plus the Python glossary for any term used on this page.