Change the values in the nested list according to the specified index list

Question

How to change the values in nested list

How to change the values in the list base on the indexes To clarify, I originally have the_list

the_list = [['a','a','a'],['b','b','b'],['b','b','b'],['c','c','c']]

However, I would like to change the values in the_list above that have the index/position in the indexA

indexA = [(0,2),(1,2),(0,1)]

which I would like to change the following index of the_list to ‘hi’

the_list[0][2]      
the_list[1][2] 
the_list[0][1]

Therefore, the expected output is

the_list = [['a', 'hi', 'hi'], ['b', 'b', 'hi'], ['b', 'b', 'b'],['c', 'c', 'c']]

Currently I’m doing it manually by what follows:

the_list = [['a','a','a'],['b','b','b'],['b','b','b'],['c','c','c']]     
the_list[0][2] = 'hi'     
the_list[1][2] = 'hi'      
the_list[0][1] = 'hi'

Output:

the_list = [['a', 'hi', 'hi'], ['b', 'b', 'hi'], ['b', 'b', 'b'],['c', 'c', 'c']]

Please kindly recommend the better way of doing it

Thank you in advance

Asked By: Kathie K

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Source

Answer 1

for i, j in indexA:
    the_list[i][j] = 'hi'

print(the_list)

gives

[['a', 'hi', 'hi'], ['b', 'b', 'hi'], ['b', 'b', 'b'], ['c', 'c', 'c']]

Answered By: user19077881

Answer 2

you can try a parallel looping through your Index list to change the main list

for x,y in IndexA:
    the_list[x][y] = "Hi"

Answered By: ali koulani

Answer 3

The only way to change the value in the list is to change it manually as you did. The only thing you can do is use a For Loop instead of writing manually like below.

change_to = 'hi'
indexA = [(0,2),(1,2),(0,1)]   
for i in indexA:
  the_list[i[0]i[1]] = change_to

You have to manually refer to change the value. So improve it this way.

hope it helps

Answered By: Chapi Menge

Change the values in the nested list according to the specified index list

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