[Python-Dev] pyc files, constant folding and borderline portability issues

Guido van Rossum guido at python.org
Tue Apr 7 18:25:53 CEST 2009


Well I'm sorry Cesare but this is unacceptable. As Skip points out
there is plenty of code that relies on this. Also, consider what
"problem" you are trying to solve here. What is the benefit to the
user of moving this error to compile time? I cannot see any.

--Guido

On Tue, Apr 7, 2009 at 8:19 AM, Cesare Di Mauro
<cesare.dimauro at a-tono.com> wrote:
> In data 07 aprile 2009 alle ore 17:19:25, <skip at pobox.com> ha scritto:
>
>>
>>     Cesare> The only difference at this time is regards invalid operations,
>>     Cesare> which will raise exceptions at compile time, not at running
>>     Cesare> time.
>>
>>     Cesare> So if you write:
>>
>>     Cesare> a = 1 / 0
>>
>>     Cesare> an exception will be raised at compile time.
>>
>> I think I have to call *bzzzzt* here.  This is a common technique used
>> during debugging.  Insert a 1/0 to force an exception (possibly causing the
>> running program to drop into pdb).  I think you have to leave that in.
>>
>> Skip
>
> Many tests rely on this, and I have changed them from something like:
>
> try:
>   1 / 0
> except:
>  ....
>
> to
>
> try:
>  a = 1; a / 0
> except:
>  ....
>
> But I know that it's a major source of incompatibilities, and in the final
> code I'll enabled it only if user demanded it (through a flag).
>
> Cesare
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-- 
--Guido van Rossum (home page: http://www.python.org/~guido/)


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