装饰这模式

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#coding=utf8

class foo(object):
	def f1(self):
		print("or f1")
	def f2(self):
		print("or f2")
class foo_d(object):
	def __init__(self,de):
		self._de = de
	def f1(self):
		print("de f1")
	def __getattr__(self,name):
		return getattr(self._de,name)
t = foo()
v = foo_d(t)
t.f1()
v.f1()
v.f2()


######out
or f1
de f1
or f2
[Finished in 0.1s]

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#coding=utf8
import functools
def log(text):
	@functools.wraps(text)
	def wrapper(*args,**kwargs):
		print("wrapper")
		return text(*args,**kwargs)
	return wrapper
@log
def  now():
	print("time")
now()

#####output
wrapper
time
[Finished in 0.1s]