Robert Kern wrote: > Dustan wrote: > > Looking at this interactive session: > > > >>>> class A(object): > > def __init__(self, a): > > self.a = a > > def get_a(self): return self.__a > > def set_a(self, new_a): self.__a = new_a > > a = property(get_a, set_a) > > > > > >>>> class B(A): > > b = property(get_a, set_a) > > > > > > Traceback (most recent call last): > > File "<pyshell#11>", line 1, in <module> > > class B(A): > > File "<pyshell#11>", line 2, in B > > b = property(get_a, set_a) > > NameError: name 'get_a' is not defined > >>>> class B(A): > > b = a > > > > > > Traceback (most recent call last): > > File "<pyshell#13>", line 1, in <module> > > class B(A): > > File "<pyshell#13>", line 2, in B > > b = a > > NameError: name 'a' is not defined > > > > B isn't recognizing its inheritence of A's methods get_a and set_a > > during creation. > > Inheritance really doesn't work that way. The code in the class suite gets > executed in its own namespace that doesn't know anything about inheritance. > The > inheritance rules operate in attribute access on the class object later. > > Try this: > > class B(A): > b = property(A.get_a, A.set_a) > > or this: > > class B(A): > b = A.a > > -- > Robert Kern > > "I have come to believe that the whole world is an enigma, a harmless enigma > that is made terrible by our own mad attempt to interpret it as though it > had > an underlying truth." > -- Umberto Eco
Thanks for your help, and mdsteele's. -- http://mail.python.org/mailman/listinfo/python-list
