What this snippet does
lru_cache relies on the arguments being hashable; strings, ints, and tuples work perfectly.
Expected output
-8057554142674824723
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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