In article <[email protected]>,
phonky <[email protected]> wrote:
>
>import itertools
>
> class Account(object):
> def __init__(self, holder, gen=itertools.count()):
> self.__accountnumber = gen.next()
>
>If you consider my python illiteracy,
>
>"itertools.count(): Make an iterator that returns consecutive integers
>starting with n"
>
>to me that sounds like that solves the increment issue, but what about
>future modules wanting to plug in a different
>numbering format, e.g. 205434.1234 or whatever?
Here's what I would do:
class Account:
gen = itertools.count
gen_instance = None
def __init__(self, holder):
if self.gen_instance is None:
self.__class__.gen_instance = self.gen()
self._account = self.gen_instance()
Notice that I'm using only a single underscore for ``_account`` to make
inheritance simpler, and I'm using ``self`` to access class attributes
*except* when I need to *set* the class attribute, which requires
``self.__class__``.
Now anyone who wants to change the generator can simply do
module.Account.gen = other_gen
and it will work as long as no Account() instances have been created (you
don't want the generator to change mid-stream, right?).
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