On 2015-05-09 15:34, Volker Braun wrote:
On Saturday, May 9, 2015 at 2:45:02 PM UTC+2, Jeroen Demeyer wrote:

    I think you are misunderstanding the problem.


No I understand that but arg[0]=ring, arg[1]=str, and
kwds['names']=tuple are valid individually.
I don't see why that should matter.

Let me hopefully convince you with a Python example:

sage: L = [1,2,3]
sage: L.sort(cmp=cmp)        # works
sage: L.sort(cmp)            # works
sage: L.sort(cmp, cmp=cmp)   # TypeError
TypeError: Argument given by name ('cmp') and position (1)

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