Slicing versus loops, was Re: for i in range() anti-pattern
Duncan Booth
duncan.booth at invalid.invalid
Thu Nov 30 05:42:03 EST 2006
Peter Otten <__peter__ at web.de> wrote:
> That example was chosen to prove your point. The real contender for the
> "swap items" problem are slices.
>
> def swap_slice(items):
> left = items[::2]
> items[::2] = items[1::2]
> items[1::2] = left
> return items
>
It makes no difference to the time or memory use, but you can of course
also write swap_slice using the aforementioned 'well known idiom':
items[::2], items[1::2] = items[1::2], items[::2]
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