#装饰器函数
def logging(level):
    def wrapper(func):
        def inner_wrapper(*args, **kwargs):
            print "[{level}]: enter function {func}()".format(
                level=level,
                func=func.__name__)
            return func(*args, **kwargs)
        return inner_wrapper
    return wrapper

#使用 logging 来装饰
@logging(level='INFO')
def say(something):
    print "say {}!".format(something)