Adding list elements in Python

Question

I have lists D and E. I am adding element of E to each element of D. I present the current and expected outputs.

D=[[0],[1]]
E=[[4]]
G=[]
for i in range(0,len(D)): 
    for j in range(0,len(E)): 
        F=D[i]+E[j]
        G.append(F) 
print(G)

The current output is

[[0, 4], [1, 4]]

The expected output is

[[0, 4], [1, 5]]

Asked By: rajunarlikar123

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Source

Answer 1

This works.

D=[[0],[1]]
E=[[4]]
G=[]
for i in range(0,len(D)): 
    for j in range(0,len(E)): 
        F=[D[i][0], D[i][0]+E[j][0]]
        G.append(F) 
print(G)

Answered By: rajunarlikar123

Answer 2

D=[[0],[1]]
E=[[4]]
G = []
for item in D:
    for item_ in E:
        F = [item[0], item[0] + item_[0]]
        G.append(F)
print(G)

or by using itertools:

import itertools
D=[[0],[1]]
E=[[4]]
G=[]
for item, item_ in itertools.product(D, E):
    F = [item[0], item[0] + item_[0]]
    G.append(F)
print(G)

Answered By: Rockkley

Answer 3

my approach for even longer lists:

   D=[[0],[1]]
   E=[[4],[5]]
   G=[]
   for i in range(len(D)): 
       for j in E:
           for a in j:
               G.append(D[i]+[a+i])
    print(G)

This results in a list of all possible combinations between the elements of D and E. The code uses the length of the lists D and E to determine the number of iterations, so it can handle lists of any length without needing to modify the code.

Answered By: 1aryo1

Adding list elements in Python

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