What this snippet does
Lists are unhashable; passing them to an lru_cache function raises TypeError.
Expected output
TypeError: unhashable type: 'list'
Why practise typing this
Typing functions (advanced) 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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