Python __getattr__與__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，在賦值書的value屬性時，偷偷的將value減去了１００，呵。輸出結果：

Python
0
Python cost : 0
Type is not found!