Class Python

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  4. __setattr__ and __dict__
class accesscontrol:
     def __setattr__(self, attr, value):
         if attr == 'age':
             self.__dict__[attr] = value
         else:
             raise AttributeError, attr + ' not allowed'
X = accesscontrol()
X.age = 40                     # calls __setattr__
print X.age
X.name = 'mel'
print X.name