getter setter

attr.py

def attr(name):
        n = '__' + name
        def fget(self):
            print 'get'
            return self.__dict__[n]

        def fset(self, x):
            print 'set'
            self.__dict__[n] = x
        tmp = locals()
        del tmp['name']
        del tmp['n']
        return property(**tmp)

def attr2(name):
        n = '__' + name
        def fget(self):
            print 'get'
            return self.__dict__[n]

        def fset(self, x):
            print 'set'
            self.__dict__[n] = x
        return property(fget, fset)
 
class X(object):
    def __init__(self):
        pass
    y = attr('y')
    
x = X()
x.y = 1
print x.y