[PyQt] SIP support for keyword arguments in __call__ ?

[Phil Thompson]

On Mon, 8 Mar 2010 08:43:31 +0530, Ravi kumar <ravi.kumar.039 at gmail.com>
wrote:
> Hello
> 
> I was trying to pass keyword arguments to operator ()
> of a class from python. The class was extended using SIP.
> The name of the class is Signal (it is not Qt's signal).
> 
> At first i tried /NoArgParser/ on __call__ but it was
> not producing the code i wanted. So, just to give it a try,
> i manually removed all the argument parsing code from the
> generated function, and added another PyObject* to the
> argument list to slot_Signal___call__. But soon i realized
> that anything done on it results in segmentation fault, which
> means nothing is being passed to it.
> 
> Then i investigated the source code of sip. In siplib/siplib.c
> i found this function :
> static PyObject *slot_call (PyObject *self, PyObject *args, PyObject
> *kwargs)
> 
> With trivial changes to this function, and recompiling sip
> the keyword arguments were working fine, though still code
> generated by sip needed to be modified.
> 
> But the main question i wanted to ask, is that i found a note
> written in siplib.c just above that slot_call function :
> 
> "The type call slot. Note that keyword arguments aren't supported".
> 
> Was there any specific reason to avoid support for keyword
> arguments ? If not, then i am willing to write a patch for
> code generator (sipgen) so that it honors /NoArgParser/ and provides
> an additional argument for keywords, should i go ahead ?

You can try. I think you will have to introduce a new slot type so that you
don't break backwards binary compatibility.

Phil