Wildemar Wildenburger wrote:
>>>> class Observable(object):
> ... def __init__(self, func, instance=None, observers=None):
> ... self.func = func
> ... self.instance = instance
> ... self.observers = observers or []
Unless you also changed code in __get__, this means you'll get a new
list every time you access the "meth" attribute since the __get__ method
is called anew for every attribute access::
>>> class SomeActor(object):
... @Observable
... def meth(self, foo):
... print foo
...
>>> def callback(instance):
... print "Yippie, I've been called on", instance
... instance.bar = True
...
>>> # only accessing the "meth" attribute once
>>> meth = a1.meth
>>> meth.add_callback(callback)
>>> meth('a1')
a1
Yippie, I've been called on <__main__.SomeActor object at 0x00E87CB0>
>>> # accessing the "meth" attribute multiple times
>>> a1 = SomeActor()
>>> a1.meth.add_callback(callback)
>>> a1.meth('a1')
a1
See my other post for how to get instance-level observer lists using a
WeakKeyDictionary.
STeVe
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