python(@property,setter,deleter)

class Women(object):
    def __init__(self, age):
        #   age  ， _age    
        self.age = age
    def set_age(self,value):
        if not isinstance(value,int):
            raise TypeError('age must be a int value !')
        self._age = value
    @property
    def age(self):
        return self._age
    @age.setter
    def age(self, value):
        #                ，            
        if not isinstance(value, int):
            raise TypeError('age must be a int value !')
        self._age = value
        #                
        if self._age >= 18:
            #       ，      
            self.is_ok = True
            print('    ')
        else:
            self.is_ok = False
            print('   ！')
    # @age.deleter        age              
    @age.deleter
    def age(self):
        #        ，          
        if hasattr(self, '_age'):
            del self._age
            print('    _age  ！')
        else:
            print('%s  _age  ，        '%self)
w = Women(0)
print(w.age,w.is_ok)
w.age = 18
print(w.age,w.is_ok)
del w.age
    ：    _age  ！
del w.age
    ：
<__main__.women object="" at="">  _age  ，