There is already a ticket for that:

https://trac.sagemath.org/ticket/26254

but no one is working on it.

On Sunday, July 21, 2019 at 1:32:24 AM UTC+9, John H Palmieri wrote:
>
> See 
> https://ask.sagemath.org/question/47214/help-doesnt-show-function-call/. 
> Some of the time when you evaluate
>
>    blah?
>
> the signature is not present. Is this a bug or is it intended?
>
> I like this behavior:
>
> sage: A = SteenrodAlgebra()
> sage: A.antipode?
> Signature:      B.antipode(self, *args)
> Call signature: B.antipode(*args)
> Type:           ModuleMorphismByLinearity_with_category
> String form:    Generic endomorphism of mod 2 Steenrod algebra, milnor 
> basis
> File:           ~/Desktop/Sage_stuff/git/sage/local/lib/python2.7/site-
> packages/sage/modules/with_basis/morphism.py
> Docstring:     
>
>    ...
>
> but not this:
>
> sage: mat = random_matrix(ZZ, 3, 3)
> sage: mat.add_multiple_of_row?
> Docstring:     
>    ...
>
>
>
> -- 
> John
>
>

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