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What, no FeelingsPartyFactory?
What about numbers in other representations, e.g. hex values? The description doesn't mention bases, I'd expect it to work for all bases.
But
digital_root(0xff)would be by definition (the recursive sum of all the digits)0xf + 0xf = 0x1e -> 0xf. Treating0xffas a base-10 number (255) leads to a different result (3).For a complete solution, I'd say one should make the function also require a base, or mention that base 10 is assumed in the description.