Arnaud Delobelle wrote:
>>>> http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/502237
[snip]
> Although I don't see the necessity of a metaclass: you could have
>
> class Record(object):
> def __init__(self, *vals):
> for slot, val in zip(self.__slots__, vals):
> setattr(self, slot, val)
> # And the other methods
>
> if you want positional slots initialisation. I chose keyword
> arguments in mine
You could certainly do it that way, but note that the one with the
metaclass not only allows *either* positional or keyword arguments, but
also displays better help messages -- using the *vals or **vals code,
help() will tell you something like:
__init__(self, **vals)
while using the metaclass-generated __init__, help() will tell you the
more informative:
__init__(self, name)
(Or whatever signature is appropriate given the __slots__.) So no, it's
not necessary, but it does have a few advantages.
STeVe
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