How to Adding Functionality to a Class by metaclass(not by inherit)

[kyo guan]

How to Adding Functionality to a Class by metaclass(not by inherit)

#example:

import inspect

class Foo(object):
def f(self):
pass

def g(self):
pass

class MetaFoo(type):
def __init__(cls, name, bases, dic):
super(MetaFoo, cls).__init__(name, bases, dic)

for n, f in inspect.getmembers(Foo, inspect.ismethod):
setattr(cls, n, f)

#Bar want to achieve Foo's part/all functionality, but not by inherit

class Bar(object):
__metaclass__ = MetaFoo

b = Bar()
b.f() TypeError: unbound method f() must be called with Foo instance as first argument (got nothing instead) Bar.f <unbound method Foo.f> b.f

<unbound method Foo.f>

how can I set Bar.f as <unbound method Bar.f>

[Steven Bethard]

kyo guan wrote:

How to Adding Functionality to a Class by metaclass(not by inherit)
[snip]
class MetaFoo(type):
def __init__(cls, name, bases, dic):
super(MetaFoo, cls).__init__(name, bases, dic)

for n, f in inspect.getmembers(Foo, inspect.ismethod):
setattr(cls, n, f)

^^^^^^^^^
f.im_func

See if that works. I think it should.

But the real question is why you want to do this. Why can't you just
inherit from Foo?

STeVe