On 4 сент, 22:59, Carl Banks <[EMAIL PROTECTED]> wrote:
> You can write code to guard against this if you want:
>
> class A:
> legal = set(["x"])
> def __setattr__(self,attr,val):
> if attr not in self.legal:
> raise AttributeError("A object has no attribute '%s'" %
> attr)
> self.__dict__[attr] = val
> def __init__(self,x):
> self.y = x
>
> I suspect most people who go into Python doing something like this
> soon abandon it when they see how rarely it actually catches anything.
>
> Carl Banks
'__slots__' is better:
class A(object):
__slots__ = set(["x"])
def __init__(self, x):
self.y = x
this will do the same, only faster
>>> A(1)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "<stdin>", line 4, in __init__
AttributeError: 'A' object has no attribute 'y'
Ivan Illarionov
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