On 01/17/2011 11:36 PM, Dave Angel wrote:
On 01/-10/-28163 02:59 PM, Karim wrote:
Hello,
I implemented Observer DP on a listbox (Tkinter) as follows and I don't
understand why super() is not working and Observable.__init__(self) is
working, cf below:
class ListObservable(Listbox, Observable):
"""Creation de widget Listbox"""
def __init__(self):
super(ListObservable, self).__init__()
#Observable.__init__(self)
self._value = None
self.listeContenu = StringVar()
self.listeContenu.set(' '.join(sorted(data_base.keys())))
self.liste = Listbox(listvariable=self.listeContenu,
selectmode='single')
self.liste.grid(row=0, column=1, sticky=N+S+W)
self.liste.bind('<Button-1>', self.onSelect)
_The error is:_
Traceback (most recent call last):
File "./observerAppliGraphique.py", line 118, in <module>
app=App()
File "./observerAppliGraphique.py", line 37, in __init__
self.sujet.attach(self.nom)
File "/home/karim/guiObserver/observable.py", line 11, in attach
self._observers.append(observer)
AttributeError: 'ListObservable' object has no attribute '_observers'
And the Observable class is:
class Observable(object):
"""Sujet a observer"""
def __init__(self):
self._observers = []
print('constructeur observable')
def attach(self, observer):
"""Attache un nouvel observateur"""
self._observers.append(observer)
def detach(self, observer):
"""Retire un nouvel observateur"""
self._observers.remove(observer)
def notify(self):
"""Avertit tous les observateurs que l'observable change d'etat"""
for observer in self._observers:
observer.update()
Just looking at what you supply, I'd suppose that ListBox doesn't
correctly call super() in its own __init__() method.
So I took a look at Tkinter.py, and sure enough, it just calls its own
direct parent, Widget.l
super() only works if all the classes you use are done consistently.
DaveA
Thanks for this precision!
Regards
Karim
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