Newbie Q: Class Privacy (or lack of)

[Antoon Pardon]

On 2006-07-28, Marc 'BlackJack' Rintsch <bj_666 at gmx.net> wrote:
>> 
>> class MyClass(object):
>> 
>>     __slots__ = ('bar',)
>> 
>>     def func(self):
>>         return 123
>> 
>> x = MyClass()
>> x.instance_var_not_defined_in_the_class = 456
>> ==>
>> AttributeError: 'MyClass' object has no attribute
>> 'instance_var_not_defined_in_the_class'
>> 
>> x.func = 789
>> ==>
>> AttributeError: 'MyClass' object attribute 'func' is read-only
>> 
>> Only the bar-attribute can be set:
>> 
>> x.bar = 'foo'
>
> This avoids the problem but you get others in return.  And it's an abuse
> of `__slots__` which is meant as a way to save memory if you need really
> many objects of that type and not as "protection".

I find that a strange purpose because when you are working on a class,
you don't necessarily know if you will ever know many instance of that
class. So should I use __slots__ in all my classes, just to be sure
for when someone wants many instances of one?

-- 
Antoon Pardon