python 装饰器

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def use_logging(func):

	def wrapper(*args, **lkwargs):
		logging.warn("%s is running" % func.__name__)
		return func(*args, **lkwargs)
	return wrapper

def bar():
	print('i am bar')

bar = use_logging(bar)
bar()
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class Foo(object):
	def __init__(self, func):
		self._func = func

	def __call__(self):
		print('class decorator running')
		self._func()
		print('class decorator ending')

@Foo
def bar():
	print('bar')

bar()