[PEAK] Re: generic functions and keyword arguments

[Phillip J. Eby]

At 09:57 AM 8/4/2008 +0300, Vladimir Iliev wrote:
>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'

Hmm.  I'm getting this:

Python 2.5.1 (r251:54863, Nov 28 2007, 17:53:19) [MSC v.1310 32 bit (Intel)] on
win32
Type "help", "copyright", "credits" or "license" for more information.
 >>> from peak.rules import *
 >>> @abstract
... def func(x, **k): pass
...
 >>> @when(func,(str,))
... def fstr(x,**k): print 'str'
...
 >>> func('x')
str
 >>> func('x',y=42)
str
 >>> func('x', y=5)
str
 >>>

Are you sure that's all the code needed for you to reproduce the problem?