En Sun, 10 May 2009 00:04:17 -0300, Дамјан Георгиевски <gdam...@gmail.com>
escribió:
How can I dynamically insert a base class in a given class? Yeah, I'm
writing a class decorator that needs to manipulate the class by
inserting another base class in it.
In this case, as you want to modify the base classes, I think a metaclass
is more apropiate (the decorator acts too late, *after* the class has
already been created).
Based on your code:
class ReallyBase(object):
def someimportantmethod(self):
return 'really really'
def dynamically_determine_metaclass(args):
class MyMetaclass(type):
def __new__(meta, name, bases, namespace):
bases = (ReallyBase,) + bases
namespace['some_value'] = args
return type.__new__(meta, name, bases, namespace)
return MyMetaclass
class Unsuspecting(object):
__metaclass__ = dynamically_determine_metaclass(123)
def stuff(self):
return "ok"
u = Unsuspecting()
print u.stuff(), u.someimportantmethod(), u.some_value,
Unsuspecting.some_value
--
Gabriel Genellina
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