Tuple slices
Steven Bethard
steven.bethard at gmail.com
Mon Jan 24 14:59:07 EST 2005
Fredrik Lundh wrote:
> Steven Bethard wrote:
>>
>>My impression was that full tuple copies didn't actually copy, but that slicing a subset of a
>>tuple might. Not exactly sure how to test this, but:
>>
>>py> a = 1, 2, 3
>>py> a[:2] is a[:2]
>>False
>
> yup. and to figure out why things are done this way, consider this case:
>
> >>> a = give_me_a_huge_tuple()
> >>> len(a)
> (a rather large number)
> >>> b = a[:2]
> >>> del a
>
> (IIRC, I proposed to add "substrings" when I implemented the Unicode string
> type, but that idea was rejected, for the very same "and how do you get rid of
> the original object" reason)
Ahh. Yeah, that seems sensible. I don't think I've ever written code
like that, but if I did, I'd almost certainly want it to work as it does
now...
Steve
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