[PEAK] Re: generic functions and keyword arguments

[Vladimir Iliev]

Phillip J. Eby написа:
> At 05:14 PM 8/2/2008 +0300, Vladimir Iliev wrote:
>> hi, can i somehow use keyword arguments with peak.rules based generic 
>> functions ?
> 
> Arguments passed by keyword are treated the same as arguments passed by 
> position, so e.g.:
> 
>  def a(b, c):
>      ...
> 
> can be called with "a(c=1,b=2)".   If you mean, can you do this:
> 
> 
>   def a(**kw):
> 
> and then test for whether the caller passed in b=2, you would use rules 
> like:
> 
>   @when(a, "'b' in kw and kw['b']==2")
> 
> in order to dispatch on arguments that are not part of the generic 
> function's "def" signature.

no, i just want to pass arguments that are not part of the signature 
through the gf.

if i do this:

@abstract
def func(x, **k):
     pass

@when(func, (str,))
def func_str(x, **k):
     print 'str'


func('x', y=5)

i'm getting TypeError: callback() got an unexpected keyword argument 'y'