[Python-ideas] About calling syntax

[Talin]

Georg Brandl wrote:
> Bruce Frederiksen schrieb:
>> Leif Walsh wrote:
>>> On Tue, Sep 9, 2008 at 11:16 AM, Zaur Shibzoukhov <szport at gmail.com> wrote:
>>>   
>>>> Would be desirable to allow two equivalent forms of calling syntax in python:
>>>>
>>>> <caller>(<positional_arguments>, <keyword_arguments>)
>>>>
>>>> and
>>>>
>>>> <caller>(<keyword_arguments>, <positional_arguments>)
>>>>
>>>> ?
>>>>     
>>> I think you are talking about PEP 3102: http://www.python.org/dev/peps/pep-3102/
>>>   
>> I don't think so.  This PEP does not affect the syntax for calling a 
>> function.
> 
> It does, in that you can do
> 
> foo(*args, flag=True)
> 
> which is currently a SyntaxError.
> 
> However, exchanging poisitional and keyword arguments is not in the scope of
> the PEP, and isn't likely to have any future at all -- it's just too ambiguous
> when the called object has named arguments instead of a catch-all *args in
> its signature.

Correct.

However, to address the OP's question, do this instead:

foo = \
    Foo(x=1, y=2,
       [Foo(
          x=4, y=5,
          [Foo(x=3,y=4),
           Foo(x=5,y=6))]
       )]
    )

Or, have Foo() return a callable:

foo = \
    Foo(x=1, y=2)(
       Foo(x=4, y=5)(
          Foo(x=3,y=4)(),
          Foo(x=5,y=6)())
       )
    )

Or any number of other variations...

-- Talin

> 
> Georg
>