Python __getattr__与__setattr__使用方法

比如下面的例子：

class book(object):
    def __setattr__(self, name, value):
        if name == 'value':
            object.__setattr__(self, name, value - 100)
        else:
            object.__setattr__(self, name, value)
    def __getattr__(self, name):
        try:
            return object.__getattribute__(name)
        except:
            return name + ' is not found!'
    def __str__(self):
        return self.name + ' cost : ' + str(self.value)

c = book()
c.name = 'python'
c.value = 100
print c.name
print c.value
print c
print c.type

上面的例子中，在赋值书的value属性时，偷偷的将value减去了１００，呵。输出结果：

python
0
python cost : 0
type is not found!