差不多了，您只需要在内部进行一些自省__getattr__，就可以在原始属性可调用时返回一个新的包装函数：
class Wrapper(object):
def __init__(self,wrapped_class):
self.wrapped_class = wrapped_class()
def __getattr__(self,attr):
orig_attr = self.wrapped_class.__getattribute__(attr)
if callable(orig_attr):
def hooked(*args, **kwargs):
self.pre()
result = orig_attr(*args, **kwargs)
# prevent wrapped_class from becoming unwrapped
if result == self.wrapped_class:
return self
self.post()
return result
return hooked
else:
return orig_attr
def pre(self):
print ">> pre"
def post(self):
print "<< post"
现在使用以下代码：
number = Wrapper(Simple)
print "\nCalling wrapped 'one':"
number.one()
print "\nCalling wrapped 'two':"
number.two("2")
结果是：
Calling wrapped 'one':
>> pre
one
<< post
Calling wrapped 'two':
>> pre
two2
<< post
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