Python非线性切片(Python non-linear slicing)

 给出一个列表a ，我可以通过这样做来切片： 
 
a[start:end:step]
 
 然而，这只是线性切片。 例如，我想选择2的幂的索引。不幸的是，这不起作用： 
 
a[slice(2**x for x in range(len(a))]
 
 当需要非线性切片时，是否有避免循环的方法？ 
 
 编辑 ：主要是我需要这个修改列表。 例如 
 
a[*non-linear-slicing*] = [*list-with-new-values*]

Given a list a, I can slice it by doing:
 
a[start:end:step]
 
However this is only linear slicing. For instance, I would like to select the indexes that are powers of 2. Unfortunately this does not work:
 
a[slice(2**x for x in range(len(a))]
 
Is there a way to avoid loops when non-linear slicing is required?
 
EDIT: mainly I need this to modify the list. E.g.
 
a[*non-linear-slicing*] = [*list-with-new-values*]

原文：https://stackoverflow.com/questions/47012837