What this snippet does
Tuples store references to objects; if a contained object is mutable, it can be modified even though the tuple is immutable.
Expected output
([1, 2, 3],)
Why practise typing this
Typing collections code builds muscle memory for the symbols and indentation Python uses most, which prose-based typing tests never cover. DevType measures your words per minute and accuracy on this snippet and tracks the individual characters you mistype, so later lessons can target them.
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