使用列表理解修改特定索引处的列表值

Question

So I am trying to change value at specific index to every element in list.

colors = [[f'#{f}10c2b']*3 for f in range(3)]
[colors[f//3][f%3][3]=f for f in range(9)]# Syntax is incorrect I am just making an example

What I want to do is change every element's value at index 3 with f variable

Answer 1

colors = [['#010c2b', '#010c2b', '#010c2b'], ['#110c2b', '#110c2b', '#110c2b'], ['#210c2b', '#210c2b', '#210c2b']] # your original list
f = "4" # the new value
index = 2  #the index of he item you want to replace
index1 = 0 #the index you are iterating on

newlist =[ [elem if index != count else f for count, elem in enumerate(list)] for list in colors]
print(newlist)

Output:

[['#010c2b', '#010c2b', '4'], ['#110c2b', '#110c2b', '4'], ['#210c2b', '#210c2b', '4']]