[Python-ideas] parameter omit

[Aaron Brady]

Could easily incorporate, as shown here.
#sample function with default args
def f( a,b=None,c='abc' ):
   print a,b,c

#customizer
default= object()
def call_wrapper( callable, *args, **kwargs ):
   args=list(args)
   for i,j in enumerate( args ):
      if j is default:
         offset= callable.func_code.co_argcount-\
            len(callable.func_defaults)
         args[i]= callable.func_defaults[i-offset]
   return callable( *args,**kwargs )

#the uniform calls
call_wrapper( f,0,default,'def' )
call_wrapper( f,0,'somebody',default )

-----Original Message-----
From: Aaron Brady [mailto:castironpi at comcast.net] 
Sent: Wednesday, May 09, 2007 4:56 PM
To: 'Aaron Brady'; 'Josiah Carlson'; 'python-ideas at python.org'
Subject: RE: [Python-ideas] parameter omit

You can almost do,
	b=f.func_defaults[1],
but you still have to know where the defaults start.  Very small what I'm
missing.

-----Original Message-----
From: python-ideas-bounces at python.org
[mailto:python-ideas-bounces at python.org] On Behalf Of Aaron Brady
Sent: Wednesday, May 09, 2007 4:50 PM
To: 'Josiah Carlson'; python-ideas at python.org
Subject: Re: [Python-ideas] parameter omit

No, still not uniform.  Cases might be rare, even syntactic sugar maybe.
if something huge:
	b=<def>
more huge
if something else:
	b=mything
still more
f(a,b,c).

-----Original Message-----
From: Josiah Carlson [mailto:jcarlson at uci.edu] 
Sent: Wednesday, May 09, 2007 4:51 PM
To: Aaron Brady; python-ideas at python.org
Subject: Re: [Python-ideas] parameter omit


"Aaron Brady" <castironpi at comcast.net> wrote:
> 
> Actually, I wanted a uniform way to call f.  f(a,b,c) for both cases if b
> can equal <def>.

f(a, b=...) #default c
f(a, c=...) #default b


 - Josiah

> -----Original Message-----
> From: Steven Bethard [mailto:steven.bethard at gmail.com] 
> Sent: Wednesday, May 09, 2007 3:45 PM
> To: Aaron Brady
> Cc: python-ideas at python.org
> Subject: Re: [Python-ideas] parameter omit
> 
> On 5/9/07, Aaron Brady <castironpi at comcast.net> wrote:
> > Is it possible to signal to a parameter to use its default?
> >
> > def f( a, b=None, c='' ):...
> >
> > f( 123, <def>, 'abc' )
> > f( 123, ObjA, <def> )
> 
> In this case, it's pretty easy::
> 
>     f(123, c='abc')
>     f(123, ObjA)
> 
> STeVe
> -- 
> I'm not *in*-sane. Indeed, I am so far *out* of sane that you appear a
> tiny blip on the distant coast of sanity.
>         --- Bucky Katt, Get Fuzzy
> 
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