Remove trailing spaces of an array

Question

I have a 2D array. While printing I want to remove the trailing spaces at the end of each row.

A = [[ 1,2,3 ,4 ,5],
 [16,17,18,19,6],
 [15,24,25,20,7],
 [14,23,22,21,8],
 [13,12,11,10,9]]

for i in range(len(A)):
    for j in range(len(A)):
        print(A[i][j], end = ' ')
    print()

My test case are failing because of trailing space. Can anyone tell me where the mistake is?

Thats not valid pyhton. Are you using numpy or something? Please create a minimal reproducible example. This currently only gives you a SyntaxError: invalid syntax — Patrick Artner
– Patrick Artner, Commented Apr 16, 2020 at 17:00
your J loop operates on the wrong dimension if you do not have a square input - it should be range(len(A[i]) - or better dont index but use iteration of the data itself — Patrick Artner
– Patrick Artner, Commented Apr 16, 2020 at 17:02

Patrick Artner · Accepted Answer · 2020-04-16 17:10:31Z

1

You print your spaces yourself by using

print(A[i][j], end= ' ')
               ^^^^^^^^

I would suggest doing

A = [[ 1,2,3 ,4 ,5],
     [16,17,18,19,6],
     [15,24,25,20,7],
     [14,23,22,21,8],
     [13,12,11,10,9]]

for inner in A:
    print(*inner)

Output:

1 2 3 4 5
16 17 18 19 6
15 24 25 20 7
14 23 22 21 8
13 12 11 10 9

without any trailing spaces.

answered Apr 16, 2020 at 17:10

Patrick Artner

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