On Tue, 2008-04-29 at 13:19 +0930, Darryl Ross wrote:
> Heya,
>
> I'm sure I've worked out how to to this in the past, but the syntax is
> escaping me right now.
>
>
> class DooHicky(object):
> def __init__(self, arg1=None, arg2=None):
> pass
>
> class Thingo(DooHicky):
> def __init__(self, value=None, *args, **kwargs):
> self.value = value
> super(Thingo, self).__init__(self, *args, **kwargs)
>
>
> Basically, I want to pass in an argument to my "Thingo" class which does
> not get passed back to the parent constructor.
>
> Any ideas / pointers?
# If you expect the value argument to be unspecified more often than not:
class Thingo(DooHicky):
def __init__(self, *args, **kwargs):
self.value = kwargs.get('value')
if self.value is not None:
del kwargs['value']
super(Thingo, self).__init__(self, *args, **kwargs)
# If you expect the value argument to be specified more often than not:
class Thingo(DooHicky):
def __init__(self, *args, **kwargs):
try:
self.value = kwargs.pop('value')
except KeyError:
pass
super(Thingo, self).__init__(self, *args, **kwargs)
Both of these will require you to pass value as a keyword argument.
You might also want to consider avoiding the use of inheritance. I
can't really comment on whether it is desirable to use inheritance
here, given the supplied information. Personally I try to avoid
inheritance unless it is a really nice fit for the situation.
Tim
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