Printing strings in a number array

Question

I'm trying to print strings in a matrix. But I couldn't find a solution for that.

game_size = 3
matrix = list(range(game_size ** 2))
def board():
    for i in range(game_size):
        for j in range(game_size):
            print('%3d' % matrix[i * game_size + j], end=" ")
        print()
board()
position = int(input("Where to replace ?"))
matrix[position] = "X"
board()

First it prints this as exactly what I want

  0   1   2 
  3   4   5 
  6   7   8
Where to replace ?5

Then It came up with an error;

TypeError: %d format: a number is required, not str

How can I solve this problem. I want my output like;

  0   1   2 
  3   4   X 
  6   7   8

Also X should be stored in array, just printing that doesn't work Output should be same format as it is.

Problem is here: matrix[position] = "X". From now on, the inserted object is a str type containing "X". However, in the loop you want to reformat it to %3d which is obviously illogical. You cannot reformat the "X" string to a number unless it is a number stored as a string. — s3n0
– s3n0, Commented Nov 18, 2019 at 12:19
Do you think is there a solution for that. I thinked maybe it would solve with if statements. But I couldn't make it. — Sam Fatu
– Sam Fatu, Commented Nov 18, 2019 at 12:21
Yes, sure @Ahmeed_Hawary already answered you. Use the %s (string) format istead of %d (number). So you must to be working with a string indentation as %3s and not with a number indentation such as %3d. Or better is to use the new method: str.format(). So there will the following source code: print('{0:>3}'.format(.....value....),end='') — s3n0
– s3n0, Commented Nov 18, 2019 at 12:40

CDJB · Accepted Answer · 2019-11-18 12:23:11Z

1

You are currently using a format string which requires that all the inputs are integers. I've changed this to using f-strings in the solution below.

game_size = 3
matrix = list(range(game_size ** 2))
def board():
    for i in range(game_size):
        for j in range(game_size):
            print(f'{matrix[i * game_size + j]}'.rjust(3), end=" ")
        print()
board()
position = int(input("Where to replace ?"))
matrix[position] = "X"
board()

Output with game_size=3:

0   1   2   
3   4   5   
6   7   8   

Where to replace ?5
0   1   2   
3   4   X   
6   7   8

Output with game_size=5:

  0   1   2   3   4 
  5   6   7   8   9 
 10  11  12  13  14 
 15  16  17  18  19 
 20  21  22  23  24 

Where to replace ?4
  0   1   2   3   X 
  5   6   7   8   9 
 10  11  12  13  14 
 15  16  17  18  19 
 20  21  22  23  24

edited Nov 18, 2019 at 12:23

answered Nov 18, 2019 at 12:11

CDJB

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4 Comments

Sam Fatu Over a year ago

this doesn't work for me because i want it in that format there should be gaps between numbers

Sam Fatu Over a year ago

Actually, this is not dynamic. If i give gamesize 5, last 3 row skids :(

s3n0 Over a year ago

Yes, it will work, but if you run the code on an older Python version where the print(f"{foobar}") formatting style did not exist, the code will not work there. Use standard formatting rather...as I mentioned above in my comments. So use print("{}".format(foobar)) instead of the new style format.

s3n0 Over a year ago

BTW this method .rjust() is not a neccessary ! You can use the following syntax instead: print(f'{matrix[ i * game_size + j ]:>3}', end='')

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