Nitin Das wrote:
> class mymut(object):
>
> def __setattr__(self,k,v):
> if hasattr(self,k):
> if self.__dict__.get(k) == None:
> self.__dict__[k] = v
> else:
> raise TypeError("Cant Modify Attribute Value")
> else:
> raise TypeError("Immutable Object")
>
>
> class mm(mymut):
> x = ''
> y = ''
> def __init__(self,x,y):
> self.x = x
> self.y = y
>
>
>
> p = mm(10,11)
> print p.x
> print p.y
>
>
> I have created this immutable object.Is there any other better
> implementation?
How about
>>> from collections import namedtuple
>>> Mm = namedtuple("Mm", "x y")
>>> p = Mm(10, 11)
>>> p.x
10
>>> p.y
11
>>> p.x = 42
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
AttributeError: can't set attribute
>>> p.z = 42
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
AttributeError: 'Mm' object has no attribute 'z'
>>>
Peter
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