[Python-Dev] Very Strange Argument Handling Behavior
Raymond Hettinger
raymond.hettinger at gmail.com
Fri Apr 16 23:56:09 CEST 2010
> On Fri, Apr 16, 2010 at 2:11 PM, Raymond Hettinger
> <raymond.hettinger at gmail.com> wrote:
>>
>>>> Guido van Rossum, 16.04.2010 16:33:
>>>>>
>>>>> I am fine with
>>>>> declaring dict({}, **{1:3}) illegal, since after all it is abuse of
>>>>> the ** mechanism.
>>
>> ISTM that making it illegal costs cycles with giving any real benefit.
>
> Diasagree. The real benefit is better cross-implementation portability.
Would hate for 100% of users will pay a performance penalty
when most applications aren't abusing keyword dictionaries
so they already work cross-platfrom.
Isn't there anyway to make this a one-time check instead
of a PyLint style validation check running on every invocation
of a function or method using **kwds?
Or perhaps there can be a switch or flag to enable developers to
check for non-standard uses of **kwds. That way, they can clean-up
their programs but not make the end users pay for the checks every time
they run an application that has already been cleaned-up.
Raymond
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