Class Variable Access and Assignment

[Mike Meyer]

Antoon Pardon <apardon at forel.vub.ac.be> writes:

> Op 2005-11-04, Mike Meyer schreef <mwm at mired.org>:
>>
>>> Would it be too much to ask that in a line like.
>>> 
>>>   x = x + 1.
>>> 
>>> both x's would resolve to the same namespace?
>>
>> Yes. That's to much bondage for programmers who've become accustomed
>> to freedom. Explain why this should be illegal:
>>
>>>>> class C:
>> ...  def __getattr__(self, name):
>> ...   x = 1
>> ...   return locals()[name]
>> ...  def __setattr__(self, name, value):
>> ...   globals()[name] = value
>> ... 
>>>>> o = C()
>>>>> o.x = o.x + 1
>>>>> x
>> 2
>
> I'll answer with a contra question.
>
> Please explain why this is illegal.
>
> x = 1
> def f():
>   x += 1
>
> f()

It isn't illegal, it just requires a different syntax.

   <mike
-- 
Mike Meyer <mwm at mired.org>			http://www.mired.org/home/mwm/
Independent WWW/Perforce/FreeBSD/Unix consultant, email for more information.