Logically/Selectively Sub Class?

Diez B. Roggisch deets at nospam.web.de
Sun Mar 9 22:56:19 CET 2008

xkenneth schrieb:
> On Mar 9, 4:38 pm, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
>> xkenneth schrieb:
>>> Might be a silly question, but is it possible to selectively subclass,
>>> IE subclass is a supporting module is present and not otherwise.
>> Yes, something like this should work
>> class Foo(some, base, classes)
>>     pass
>> if condition:
>>     Temp = Foo
>>     class Foo(Temp, otherclass): pass
>> Alternatively, you can use the type-function to create classes explicit
>> with a list of base-classes.
>> However it smells after bad design... what's your actual usecase?
>> Diez
> Yeah, it's really a non-issue, just more a curiosity. I'm using ZODB
> for a lot of my stuff now, and I need my objects to be persistent,
> however there might be a case where my classes could be used in a non-
> persistent manner. I'll just have ZODB as a requirement for my
> package.

Ah. Then this also might work

    from ZODB import Persistent
except ImportError:
    class Persistent: pass


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