On Jun 13, 8:00 pm, Larry Bates <[EMAIL PROTECTED]> wrote: > James Turk wrote: > > Hi, > > > I have a situation where I have some class members that should only be > > done once. Essentially my problem looks like this: > > > class Base(object): > > dataset = None > > > def __init__(self, param): > > if type(self).dataset is None: > > # code to load dataset based on param, expensive > > > class ChildClass1(Base): > > def __init__(self): > > Base.__init__(self, data_params) > > > class AnotherChildClass(Base): > > def __init__(self): > > Base.__init__(self, other_data_params) > > > This seems to work, initialization is only done at the first creation > > of either class. I was just wondering if this is the 'pythonic' way > > to do this as my solution does feel a bit hackish. > > I could be missing something but dataset is shared among all the class > instances. If you reset it based on param it will be reset every time > you create a new instance of the Base class with a different param. Is > that really what you want to do? If so just use: > > class Base(object): > dataset = None > > def __init__(self, param): > if self.dataset is None: > # code to load dataset based on param, expensive > > -Larry
I'm sorry, I somehow omitted the fact that the dataset does indeed need to vary based on the child class, actually this is the main difference between child classes. -- http://mail.python.org/mailman/listinfo/python-list
