change values in a list without a loop

Question

I want to change the values of a list without using a loop or increase the performence

Below is a part of my code.I want to add (1*2),(2*3) ..to a certain range range of the list.Is there any quicker way to do this other than using for loop

    k=1
    for j in range(3,100):
        ary[j-1]+=k*(k+1)
        k+=1

Can you clarify what exactly you're intending? What's the start to end range supposed to be? Are you looking to create a list, add values to an existing one or change values in an existing one? — SuperBiasedMan
– SuperBiasedMan, Commented Jun 24, 2015 at 13:45
Do you mean "quicker" performance-wise or as "with less lines of code"? — LeartS
– LeartS, Commented Jun 24, 2015 at 13:45

Delimitry · Accepted Answer · 2015-06-24 14:21:05Z

1

If you mean using list comprehension try this:

a = [j * (j + 1) for j in xrange(1, 100)]

It will return a list: [(1*2),(2*3),(3*4),(4*5),...]

answered Jun 24, 2015 at 14:21

Delimitry

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garciparedes · Accepted Answer · 2015-06-24 14:04:00Z

0

You can use recursive method but isn't be faster than your current code.

I think there isn't better way to modify specific range of values that not change uniformly like that.

answered Jun 24, 2015 at 14:04

garciparedes

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1 Comment

garciparedes Over a year ago

Using list comprehension is only syntax, performance is the same.

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