[issue20168] Derby: Convert the _tkinter module to use Argument Clinic

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

call() just converts all args to Tcl list. Is Argument Clinic supports *args 
and **kwargs? I'm not sure there is a benefit with using Argument Clinic here.

splitlist() and split() first call PyArg_ParseTuple with one argument, check 
the input, and then may call PyArg_ParseTuple with other argument. They need 
large refactoring to use Argument Clinic.

getint(), getdouble(), getboolean() first manually unpack arguments tuple, and 
then may call PyArg_ParseTuple. Same as above.

setvar()/globalsetvar(), getvar()/globalgetvar(), unsetvar()/globalunsetvar() 
shares common code parametrized by flags. I think this is resolvable. But 
worse, they can delegates their execution to other thread and should save all 
arguments in events queue. And this looks absolutely unsuitable for Argument 
Clinic.

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<http://bugs.python.org/issue20168>
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