Talk:Practical numbers

Python: Comment on type hints for the functional example

Hout Wrote:

Clarity about the return type semantics, is however, very useful when reasoning about pure functions, and my personal approach is to add light informal comments about the type, in a Hindley Milner idiom, which lends itself well to brief and clean notes on the type of curried functions, which are more easily composable, especially with higher order functions, and which I generally prefer to use.

I've been asked (always by the same person :-) why I don't find the idiom of Python compiler type-hints a good match for my semantic type comments, and the answer is essentially that the compiler type hints are not a clear or helpful notation for this purpose – not just because they generally involve more typing and visual noise, but also, and in particular, because with curried functions the compiler hint notation becomes swamped by use of the cognitively redundant `Callable` keyword, which degrades clarity, and imposes burden, for the human reader.

I replaced misleading Haskell-language type comments by Python typing checked with MyPy. Python can add typing in comments as part of the language and that too is not the Haskell that was replaced.
--Paddy3118 (talk) 09:17, 31 March 2021 (UTC)