高级闭包用法

#!/usr/bin/env python
# !-*-coding:utf-8-*-

"""
高级装饰器和闭包实例
"""
import time

def logged(when):
    """
    输出函数的日志信息
    :param when: 选取那种日志格式
    """
    def log(f, *args, **kargs):
        print "asdfads %s" %f
        print """ Called：
        function:%s
        args:
        kargs
        """  % f

    def pre_logged(f):
        def wrapper(*args, **kwargs):
            log(f, *args, **kwargs)
            try:
                return f(*args, **kwargs)
            except Exception, e:
                print e
        return wrapper

    def post_logged(f):
        print f
        def wrapper(*args, **kwargs):
            log(f, *args, **kwargs)
            try:
                now = time.time()
                return f(*args, **kwargs)
            except Exception, e:
                print e
            finally:
                print "time waster: %d" % (time.time()-now)
        return wrapper

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


@logged("post")
def func(aa):
    print aa

func("打倒日本帝国主义")