如何在列表理解中赋值？

Question

list4 = [[10, 20, 40], [40, 50, 60], [70, 80, 90]]
for i in range(len(list4)):
    list4[i][-1] = 100
print(list4)

It works, but how could i set a value in list comprehension

list5 = [i for i in range(len(list4)) list4[i][-1] = 100]

Answer 1

I think the following list comprehension gives same operation as the for loop:

list5 = [arr[:-1]+[100] for arr in list4]