The purpose of callable is to report whether an instance is callable or not, and that information is available on the instance's class, via the presence of __call__.  It is not up to callable() nor iter() nor ... to figure out that, even though the special method __call__ or __iter__ or ... exist, the object isn't /really/ what it says it is.

If you have special needs then write special functions, and they can be imported and used instead of the regular built-in ones.