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Python __getattr__与__setattr__使用方法
出处:互联网 整理: 软晨网（RuanChen.com） 发布: 2009-09-11 浏览: 94 ::
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__getattr__和__setattr__可以用来对属性的设置和取值进行处理 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
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：
0
Python cost : 0
Type is not found!
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