manatlan wrote:
> I've got an instance of a class, ex :
>
> b=gtk.Button()
>
> I'd like to add methods and attributes to my instance "b".
> I know it's possible by hacking "b" with setattr() methods. But i'd
> like to do it with inheritance, a kind of "dynamic subclassing",
> without subclassing the class, only this instance "b" !
>
> In fact, i've got my instance "b", and another class "MoreMethods"
>
> class MoreMethods:
> def sayHello(self):
> print "hello"
>
> How could i write ...
>
> "b = b + MoreMethods"
You can simply bind the methods you want to add to the Button instance.
That means doing the equivalent of ``b.sayHello = sayHello.__get__(b)``.
For example::
>>> class Button(object):
... def set_label(self, label):
... print 'setting label:', label
...
>>> def add_methods(obj, cls):
... for name, value in cls.__dict__.items():
... if callable(value) and hasattr(value, '__get__'):
... setattr(obj, name, value.__get__(obj, type(obj)))
...
>>> b = Button()
>>> b.set_label('k')
setting label: k
>>> b.say_hello()
Traceback (most recent call last):
File "<interactive input>", line 1, in <module>
AttributeError: 'Button' object has no attribute 'say_hello'
>>> class MoreMethods(object):
... def say_hello(self):
... print 'hello'
...
>>> add_methods(b, MoreMethods)
>>> b.set_label('m')
setting label: m
>>> b.say_hello()
hello
HTH,
STeVe
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