Forwarding keyword arguments from one function to another

[Albert Hopkins]

On Sun, 2009-02-22 at 11:44 -0800, Ravi wrote:
> The following code didn't work:
> 
> class X(object):
>         def f(self, **kwds):
>                 print kwds
>                 try:
>                         print kwds['i'] * 2
>                 except KeyError:
>                         print "unknown keyword argument"
>                 self.g("string", **kwds)
                                   ^^^^^^

This means call g() with kwds passed as keyword arguments.

>         def g(self, s, kwds):

The method signature is not expecting keyword arguments.

>                 print s
>                 print kwds
> 
> if __name__ == "__main__":
>         x = X()
>         x.f(k = 2, j = 10)
> 
> 
> However the following did:
> 
> class X(object):
>         def f(self, **kwds):
>                 print kwds
>                 try:
>                         print kwds['i'] * 2
>                 except KeyError:
>                         print "unknown keyword argument"
>                 self.g("string", **kwds)
> 
>         def g(self, s, **kwds):
                         ^^^^^^
The method signature expects (optionally) keyword arguments.

>                 print s
>                 print kwds
> 
> if __name__ == "__main__":
>         x = X()
>         x.f(k = 2, j = 10)
> 
>