problem about list indexing

Steven D'Aprano steve at REMOVE.THIS.cybersource.com.au
Sun Nov 26 11:35:39 CET 2006


On Sun, 26 Nov 2006 00:25:13 -0800, hollowspook wrote:

> Hi, there
> 
> a = range(100)
> 
> if I want to use No 7, 11, 56,90 in a, then the only way I do is [a[7],
> a[11], a[56], a[90]]. 
> Is there any other way?

a = [7, 11, 56, 90]

Are those numbers supposed to be in some sort of series? They aren't an
arithmetic series:

(11 - 7) = 4
(56 - 11) = 45  # not a constant difference

nor are they a geometric series:

(11/7) = 1.57
(56/11) = 5.09  # not a constant ratio

They don't look like some form of a Fibonacci series:

7+11 != 56
11+56 != 90

If they're just "random" numbers, plucked out of thin air, then you
probably can't calculate them and you'll need to just create them in a
list a = [7, 11, 56, 90].



-- 
Steven.




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