Optional parameter object re-used when instantiating multiple objects

[Chris Rebert]

For the Nth time this year that this has come up, I'll point out yet
again that this issue has already been discussed to death before:

[Python-ideas] proto-PEP: Fixing Non-constant Default Arguments
http://mail.python.org/pipermail/python-ideas/2007-January/000121.html

[Python-3000] pre-PEP: Default Argument Expressions
http://mail.python.org/pipermail/python-3000/2007-February/005704.html

Result: Evaluating the arguments at runtime rather than
definition-time was deemed too magical; the backward compatibility
issues make changes unlikely; it's hard to find an acceptable syntax.

But hey, if some people want to have another go at it, best of luck.

Cheers,
Chris
-- 
Follow the path of the Iguana...
http://rebertia.com


On Sun, Nov 16, 2008 at 8:11 PM, alex23 <wuwei23 at gmail.com> wrote:
> On Nov 17, 12:27 pm, Steve Holden <st... at holdenweb.com> wrote:
>> If multiple statements are needed to perform the
>> argument initialization, how would you then propose the problem should
>> be solved?
>
> Why, with another function of course!
>
> def f(x, y=`f_arg_computation(x)`): ...
>
> Or my personal favourite:
>
> def f(x, **`f_arg_computation(x)`): ...
>
> Seriously, though, I agree with Steve; the function body -is- the
> place for computation to occur.
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>