En Sat, 18 Apr 2009 19:39:24 -0300, Pavel Panchekha
<pavpanche...@gmail.com> escribió:
On Apr 18, 4:01 pm, Piet van Oostrum <p...@cs.uu.nl> wrote:
But you can give each object its own class and then put the special
methods in that class:
>>> def create_special_object(bases, *args):
... if not isinstance(bases, tuple):
... bases = bases,
... cls = type("SpecialClass", bases, {})
... return cls(*args)
...>>> a = create_special_object(list, [1,2,3])
>>> a
[1, 2, 3]
>>> a.__class__
<class '__main__.SpecialClass'>
>>> a.__class__.__nonzero__ = lambda self: False
>>> bool(a)
False
I think this is the solution I like best.
You may want to implement some kind of cache: creating a new class for
every instance is expensive.
Also, note that those instances are not pickleable.
--
Gabriel Genellina
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