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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