用python 装饰器打log

# coding=utf-8

from time import time

def logged(when):

    def log(f,*args,**kargs):

        print("called: function:%s,args:%r,kargs:%r"%(f,args,kargs))

    def pre_logged(f):

        def wrapper(*args,**kargs):

            log(f,*args,**kargs)

            return f(*args,**kargs)

    def post_logged(f):

        def wrapped(*args,**kargs):

            now=time()

            try:

                return f(*args,**kargs)

            finally:

                log(f,*args,**kargs)

                print("time delta:%s"%(time()-now))

        return wrapped

    try:

        #从这里开始调用

        return{"pre":pre_logged,"post":post_logged}[when]

    except Exception as e:

        print(e)

@logged("post")

def hello(name):

    print("hello",name)

@logged("post")

def test(a,b=1):

    print(a+b)

hello("world")

test(1,2)