Jean-Paul Calderone wrote:
> On Tue, 10 Apr 2007 08:35:56 -0600, Steven Bethard
> <[EMAIL PROTECTED]> wrote:
>> Yes, you do still need to implement __getslice__ if you're subclassing
>> a class (like unicode or list) which provides it. The __getslice__
>> method can't be removed entirely for backwards compatibility reasons
>> (though it is being removed in Python 3000).
>
> Why does this mean that the unicode type has to implement __getslice__?
Because code could exist like::
>>> class C(list):
... def __getslice__(self, start, stop):
... return C(list.__getslice__(self, start, stop))
...
>>> type(C([1, 2, 3, 4])[:2])
<class '__main__.C'>
For similar examples, see:
http://www.google.com/codesearch?q=list.__getslice__
I couldn't find any real instances of unicode.__getslice__:
http://www.google.com/codesearch?q=unicode.__getslice__
But I suspect python-dev wouldn't think it was worth it to remove just
unicode.__getslice__ and not all the other ones...
STeVe
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