I agree with Steven here.
classmethod is the best practise, most practical, readable, future-proof,
one obvious way to do it.
On 15 Aug 2013 08:29, "Steven D'Aprano" <st...@pearwood.info> wrote:
> On Wed, 14 Aug 2013 14:16:31 +0000, climb65 wrote:
>
> > Hello,
> >
> > here is a small basic question :
> >
> > Is it possible to have more than one constructor (__init__ function) in
> > a class? For instance, to create an object with 2 different ways? If my
> > memory is good, I think that with C++ it is possible.
> >
> > Thanks for your answer.
>
> Yes it is. The built-in type dict is a good example, there is the regular
> default constructor[1] that you can call like this:
>
> dict([('a', 100), ('b', 200)], spam=1, ham=2, eggs=3)
>
>
> Plus there is an alternative constructor that you can call like this:
>
> dict.fromkeys(['a', 'b', 'spam', 'ham', 'eggs'])
>
>
> The way to create an alternative constructor is to use a class method:
>
>
> def MyDict(dict):
> @classmethod
> def fromkeys(cls, keys):
> ...
>
>
> If you need further details, please ask.
>
>
>
>
> [1] The constructor is __new__, not __init__. __init__ is called to
> initialise the instance after __new__ constructs it.
>
>
> --
> Steven
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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