[Tutor] use of __new__

[spir]

Le Fri, 12 Jun 2009 22:37:17 +1000,
Lie Ryan <lie.1296 at gmail.com> s'exprima ainsi:

> >>> class Normal(object):  
> ...     def __new__(cls, arg):
> ...         if arg:
> ...             return Special(arg)
> ...         else:
> ...             ret = super(Normal, cls).__new__(cls)
> ...             ret.__init__(arg)
> ...             return ret
> ...     def __init__(self, arg):
> ...         self.arg = arg
> ...


Forgot a question. You & I create and return a special object directly (above: "Special(arg)"). But the docs say we should use __new__ instead.

Denis
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