添加一个数字以在指定的索引范围内列出

Question

Input

l = [0, 0, 1, 2, 3]

I want to add 1 to index range from 2 to 3

so output should be

l = [0, 0, 2, 3, 3]

l[2:3] = l[2:3] + 1

Answer 1

The easiest way would be to use numpy , it's quite optimized and uses C/C++ loops under the hood, so it's blazingly fast:

>>> import numpy as np
>>> a = [0, 0, 1, 2, 3]
>>> b = np.array(a)
>>> b[2:4] += 1
>>> b
array([0, 0, 2, 3, 3])
>>> 

Answer 2

You can try this:

for i in range(2, 4):
    l[i] += 1

Answer 3

一个可能的解决方案可以使用列表理解： l[2:4] = [x+1 for x in l[2:4]]

Answer 4

For a hilariously overblown solution:

from operator import add

l = [0, 0, 1, 2, 3]
deltas = [0, 0, 1, 1, 1]

result = list(map(add, l, deltas))

note that this does not modify l , but creates a new list in result