Frans Englich wrote:
>> > >>> class Foo(object):
>> >
>> > ... cache = {}
>> > ... def __new__(cls, id):
>> > ... try:
>> > ... return cls.cache[id]
>> > ... except KeyError:
>> > ... pass
>> > ... cls.cache[id] = result = object.__new__(cls, id)
>> > ... return result
>> > ... def __init__(self, id):
>> > ... self.id = id
>> > ... def __repr__(self):
>> > ... return "Foo(id=%r)" % self.id
>> > ...
>>
>> I'm not sure, but I think this code misses one thing: that __init__ is
>> called each time __new__ returns it, as per the docs Peter posted.
>
> Ahem, John I ment :)
You are right -- just put the initialization into the __new__() method,
then.
Peter
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