On 10/29/2012 04:32 AM, Chris Angelico wrote:
I wonder if what the OP is looking for is not slicing, but something
more akin to map. Start with a large object and an iterator that
produces keys, and create an iterator/list of their corresponding
values. Something like: a=[1,2,3,4,5,6,7,8,9,10] b=[a[i] for i in
xrange(-4,3)] It's not strictly a slice operation, but it's a similar
sort of thing, and it can do the wraparound quite happily. ChrisA
A list comprehension ?
That does do what I am interested in, *very* much so. Quite a gem, Chris!
:-\
I am curious as to how quickly it constructs the result compared to a
slice operation.
Eg:
a[1:5]
vs.
[ a[i] for i in xrange[1:5] ]
But, unless it were grossly slower -- so that if/then logic and slices
were generally faster -- I will use it.
Thanks.
--Andrew.
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