CODEWITHSUNDEEP
pythonarraysmultidimensional-arrayiterationcoordinates
Ted
Ted

Reputation: 65

2D Array out of range when it shouldn't be?? (PYTHON)

I am running into an issue while I am iterating through my 2D array. I am going through my 4X3 grid and changing the requested coordinate from one character to another, rather "deleting" 'B' or 'W' and instead leaving nothing( the ' - ' character). I wont get into the niddy griddy of the code, but what I can say that I am currently working with this grid:

B W B W         <= trying =>       A1 A2 A3 A4
W B W B        to get these to     B1 B2 B3 B4
B W B W        <=correspond=>      C1 C2 C3 C4

B = black game pieces W = white game pieces

Here is a snip of code so you can see where I am going with it, then I will post what I want to happen.

removeB = input("~BLACK Player, remove one of your 'B's by typing in the coordinance: ")
print("")
removeW = input("~WHITE Player, remove one of your 'W's by typing in the coordinance: ")
print("")
newgrid = copy_grid(board)
for r in range(numrows):
    for c in range(numcols):
        if(removeB == 'A1'):
            newgrid[r][c] = '-'
        elif(removeB == 'A2'):
            newgrid[r][c+1] = '-'
        elif(removeB == 'A3'):
            newgrid[r][c+2] = '-'
        elif(removeB == 'A4'):
            newgrid[r][c+3] = '-'
        elif(removeB == 'B1'):
            newgrid[r+1][c] = '-'
   etc....etc...etc...'
        if(removeW == 'A1'):
            newgrid[r-1][c-1] = '-'
        elif(removeW == 'A2'):
            newgrid[r-1][c-1] = '-'
        elif(removeW == 'A3'):
            newgrid[r-1][c+1] = '-'
        elif(removeW == 'A4'):
            newgrid[r-1][c+2] = '-'
        elif(removeW == 'B1'):
            newgrid[r][c-1] = '-'
     etc....etc...etc...

You will see that once I go into the 2nd if statement that I i change the formatting of the newgrid coordinate checking as far as index values. I did this for testing purposes as I now know that I receive the same error message for both methods. Hence my confusion.... Also, I know that I will run into an issue because inside both if/else statements, I am checking a location even if it is not that player's Color. I will get to this once I get the coordinates to cooperate.

Here is the output that I want when removeB= A1 and removeW = C4 :

  - W B W   
  W B W B
  B W B -

Here is the error message : 

Traceback (most recent call last):
  File "<pyshell#29>", line 1, in <module>
  initial()
  File "C:\Users\Ted\Desktop\Lab3.1Final.py", line 84, in initial
  newgrid[r][c] = '-'
  IndexError: list index out of range

Line 84 is the line right after the very first if(removeB == 'A1') executes and it goes to change the value at the desired coordinates.

Please let me know if I should submit any other code pertaining to this question if it would help in providing the best answers. Thanks in advance!

Upvotes: 0

Views: 69

Answers (1)

juanpa.arrivillaga
juanpa.arrivillaga

Reputation: 96277

You can go about this much more simply:

In [1]: grid = [['B','W','B','W'],['W','B','W','B'],['B','W','B','W']]

In [2]: def show_grid(grid):
    ...:     print(*(" ".join(row) for row in grid),sep='\n')
    ...:     

In [3]: def delete_at_coordinate(grid,coordinate):
    ...:     row = ord(coordinate[0]) - 65
    ...:     col = int(coordinate[1]) - 1
    ...:     grid[row][col] = '-'
    ...:     

In [4]: removeB = 'A1'

In [5]: removeA = 'C4'

In [6]: show_grid(grid)
B W B W
W B W B
B W B W

In [7]: delete_at_coordinate(grid,removeB)

In [8]: delete_at_coordinate(grid,removeA)

In [9]: show_grid(grid)
- W B W
W B W B
B W B -

Upvotes: 1

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