在过去的两天里，我一直在探索decorator以及如何使用它们来创建和修改类而不费吹灰之力。这个探索引出了这段代码。在

在工厂.py在#!/usr/bin/env python

import sys

import functools

class Factory(object):

def with_callback(self, func):

postname = func.func_name

def wraped(callback, *args, **kw):

cbname = callback.func_name

print 'Passing {post} to {cb}'.format(post=postname, cb=cbname)

premute = func(*args, **kw)

return callback(premute)

return wraped

def __str__(self):

return str(self.__dict__)

def register(self, name):

def func_wrapper(func):

self.__dict__[name] = func

return func

return func_wrapper

def __getitem__(self, name):

return self.__dict__.get(name, None)

def __setitem__(self, name):

self.register(name)

def __call__(self, name=None, *args, **kw):

return self.__dict__.get(name, None)(*args, **kw)

def copy(self, old):

class DerivedFactory(self.__class__):

def __init__(self):

self.__dict__ = old.__dict__

self.__class__ = old.__class__

return DerivedFactory()

if __name__ == '__main__':

import requests

app = Factory()

@app.register('process_response')

def process_response(response):

print response.content

@app.register('get')

@app.with_callback

def get(url):

return requests.get(url)

x = app('get', app.process_response, 'http://www.google.com')

print x

下面是工厂.py

^{pr2}$

主要有六种编程模式：命令

陈述性的

功能性

面向对象的

逻辑

象征性的

这些范例中哪一个最能描述工厂.py? 在