def hello(fn):
def wrapper():
print "hello"
fn()
print "goodby"
return wrapper
@hello #@注解语法糖
# @作用：解释器会解释成下面这样的语句：
#test()等价于test=hello(test)
def test():
pass
test()
http://www.cnblogs.com/rhcad/archive/2011/12/21/2295507.html
http://blog.csdn.net/my2010sam/article/details/8585336
http://www.au92.com/archives/when-to-use-staticmethod-classmethod-in-pthon.html