force variable declaration?

[Alan Kennedy]

Peter Rams wrote:

> thanks for your answer, I meant something like this:
> 
> counter = 0
> while counter < 100:
>     conuter = counter + 1

In Python 2.2, objects can have the "__slots__" attribute, which
contains a list of permissible attribute names. For example

class counter(object):

    __slots__ = ['count']

    def __init__(self):
        self.conut = 0

>>>mycounter = counter()
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
  File "<stdin>", line 4, in __init__
AttributeError: 'counter' object has no attribute 'conut'

In order for the __slots__ attribute to work, the class has to be a "new
style class". To ensure this, simply inherit from the "object" class,
which was also introduced in python 2.2.

More from here

http://www.python.org/doc/2.2.1/whatsnew/sect-rellinks.html#SECTION000340000000000000000

Regards,

-- 
alan kennedy
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