Bernard Lebel wrote on Fri, 8 Apr 2005 15:05:13 -0400: > I'm experimenting with basic inheritance concepts, and something that > I would assume to work returns an error. > >>>> class A: > ... def __init__( self ): > ... self.a = 13 > ... >>>> class B( A ): # create sub-class of class A > ... def __init__( self ): > ... self.b = 14
Call the __init__ of the ancestor explicitly: >>> class B(A): ... def __init__(self): ... A.__init__(self) ... self.b = 14 >>> b = B() >>> b.a, b.b (13, 14) B inherits everything from A, but by defining B.__init__, the __init__ inherited from A is replaced, so you'll need to call it explicitly. Python has no way of knowing that you still want to use the original __init__ too unless you tell it so. To demonstrate the fact that __init__ is indeed inherited: >>> class C(A): ... pass >>> c = C() # inherited __init__ (A.__init__) is called >>> c.a 13 -- Yours, Andrei ===== Real contact info (decode with rot13): [EMAIL PROTECTED] Fcnz-serr! Cyrnfr qb abg hfr va choyvp cbfgf. V ernq gur yvfg, fb gurer'f ab arrq gb PP. _______________________________________________ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
