SOS - property question

[Russell Blau]

"kepes.krisztian" <kepes.krisztian at peto.hu> wrote in message
news:mailman.2975.1094563441.5135.python-list at python.org...
>
> See that code:
> class A(object):
>       __slots__=('x','a','__v')
>       def __init__(self):
>           self.__v=0
...
> Another question: why the __slots__ is working only if this member is in
> body of  A ?
> Why isn't when it is in the __init__ procedure ?
>
>       def __init__(self):
>           self.__v=0
>           __slots__=('x','a','__v')
>

I can't answer your first question, but I can the second.  In the first
piece of code, you have defined __slots__ (correctly) as an attribute of the
class A.  In the second piece, you have created a local variable called
__slots__ within the __init__() method.  As soon as the __init__ method
returns, that local variable is gone!!  Changing it to self.__slots__
wouldn't work either, because that would define an attribute of the
*instance*, not of the *class*.  Slots and properties belong to the class,
not to its instances.


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