"John" <jfabi...@yolo.com> wrote
> >>> class Bar(dict):
> >>> pass
> >>>
> >>> foo = {'a':100, 'b':200, 'c': 300}
> >>> myvar = Bar()
> >>> myvar.update(foo)
> >>> myvar
>
> {'a': 100, 'c': 300, 'b': 200}
Hey guru's could one of you explain why such a subclass is needed. How
would
it be used. I'm not sure but does not the deepcopy() work as above?
This particular subclass does nothing different to the normal dict so its
never needed. But it's only a demo of how to use the standard dict
methods in a subclass.
In general you might subclass a dict if you wanted to change the
behaviour of some specific method, or maybe add some new methods.
Or maybe you wanted a dictionary that could take a list as a key...
or even take a list of keys and return a list of values.
Lots of reasons for wanting to modify the standard dict behaviour.
--
Alan Gauld
Author of the Learn to Program web site
http://www.alan-g.me.uk/
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