Am 28.12.2010 21:16, schrieb Hrvoje Niksic:
> Christian Heimes <[email protected]> writes:
>
>> Also this code is going to use much more memory than an ordinary tuple
>> since every instance of InternedTuple has a __dict__ attribute. This
>> code works but I had to move the cache outside the class because of
>> __slots__.
>
> Wouldn't it work inside the class as well? __slots__ applies to
> instances, not to classes themselves. In Python 3.1:
You are right as long as you don't try to rebind the variable. I
recalled that class attributes of classes with __slots__ behave slightly
different than ordinary classes. For example you can't have a writeable
slot and class default values at the same time.
>>> class Example2(object):
... __slots__ = ()
... _cache = {}
...
>>> Example2()._cache
{}
>>> Example2()._cache = {}
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
AttributeError: 'Example2' object attribute '_cache' is read-only
Christian
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