python 装饰器顺序

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@logging(level=‘INFO’)def say(something): print “say {}!".format(something)# 如果没有使用@语法，等同于# say = logging(level=‘INFO’)(say)@logging(level=‘DEBUG’)def do(something): print “do {}…".format(something)if name == ‘main’: say(‘hello’) do(“my work”)装饰器调用顺序#!/usr/bin/env python# encoding: utf-8def decorator_a(func): print func print ‘Get in decorator_a’ def inner_a(*args, **kwargs): print ‘Get in inner_a’ return func(*args, **kwargs) return inner_adef decorator_b(func): print func print ‘Get in decorator_b’ def inner_b(*args, **kwargs): print ‘Get in inner_b’ return func(*args, **kwargs) return inner_b@decorator_b@decorator_adef f(x): print ‘Get in f’ return x * 2f(1)执行结果<function f at 0x100d4b6e0>Get in decorator_a<function inner_a at 0x100d4bde8>Get in decorator_bGet in inner_bGet in inner_aGet in ff(1)等价于decorator_b(decorator_a(f))(1)