On 12 mai, 20:47, Steven Bethard <[EMAIL PROTECTED]> wrote:
> 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
Yes ! it seems very good ...
I will try that too
thanks a lot ...
class MoreMethods:
val=12
def hello(self):
self.val=13
return self.get_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)))
else:
setattr(obj, name, value)
b=gtk.Button("the_label")
add_methods(b,MoreMethods)
print b.get_label()
print b.val
print b.hello()
print b.val
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