For tuple and list, their signatures are tuple([iterable]) and list([iterable]). But actually they support keyword argument *sequence*. The parameter names in doc are sometimes just placeholders but sometimes are real parameter names. So I suggest make the implementation and doc more compliant. One method is make the parameter name in implementation *iterable*. The other is totally suppress keyword argument since it is never documented. This is not a necessary change but I think the compliment is not a bad idea.