我已经大部分工作了.我想要一个类装饰器(Decorator类),该装饰器接受可用于将方法包装在对象(Person的实例)上的参数(问候和告别).

一切正常,除了…永远不会运行Person类上的原始命令功能！如果我使用类似的方法手动调用该函数

output = getattr(instance, func.func_name)(command, *args, **kwargs)

我得到无限递归.

我该怎么做呢？完整的代码如下：

import functools

class Decorator(object):

def __init__(self, greeting, farewell, *args, **kwargs):

print "initing"

self.greeting = greeting

self.farewell = farewell

def __call__(self, func, *args, **kwargs):

print "CALLING"

@functools.wraps(func)

def wrapper(instance, command, *args, **kwargs):

return "%s, %s! %s!

%s, %s!" % (

self.greeting,

instance.name,

command,

self.farewell,

instance.name

)

return wrapper

class Person(object):

def __init__(self, name):

self.name = name

@Decorator("Hello", "Goodbye")

def command(self, data):

return data + "LIKE A BOSS"

s = Person("Bob")

print s.command("eat food")

实际输出：

initing

CALLING

Hello, Bob! eat food!

Goodbye, Bob!

预期产量：

initing

CALLING

Hello, Bob! eat food LIKE A BOSS!

Goodbye, Bob!