On Jul 14, 3:03 pm, phonky <pho...@europe.com> wrote: > Hi > > I have searched all over and haven't found the solution > for my problem yet. I am new to python, and all the time realize I > do program python in java, which is not great. > > Besides being a real-life problem, I want to > solve it as elegant as I can, using it to > also learn about python (I know I could just > hack something easy for now). > > That's what I want to do. > > I have an Account class. > An Account instance has to get an account number. > On instance creation, I want the account number to > be generated (I don't want callers to pass > the account # to ensure uniqueness): > > class Account(object): > def __init__(self, holder): > self.__accountnumber = self.__generate_account_number() > > Now, I do not know yet how the account number scheme looks like. > For now, I just want to have an incremental number; later, > when going to production, we'll need the proper one. > > Furthermore, as we plan to distribute the package, we want > to allow custom account numbering schemes. Thus, customers > should be able to plug in their own AccountNumberGenerator implementation. > > For now, I have a generators.py module. > > I have an AccountNumberGenerator base class, > all subclasses should implement "generate". > > I have an IncrementalGenerator subclass. > > So for now, I need to instantiate IncrementalGenerator, > allowing for a future module to plugin their own generator. > > Any suggestions on how to do this? > Thanks so much!!!!
You don't want an AccountNumberGenerator class and subclassing, all you need is an iterator/generator of some form. These might help: http://docs.python.org/tutorial/classes.html#iterators http://docs.python.org/tutorial/classes.html#generators (in fact, that whole page is pretty relevant) Once your code expects one of those, it's trivially easy to plug something else in there. -- http://mail.python.org/mailman/listinfo/python-list
