What this snippet does
Python 3.12 allows defining generics directly in class/function signatures using [T] without TypeVar.
Expected output
[1]
Why practise typing this
Typing typing (modern python 3.12+) 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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