How to edit the elements of a 2d array and display the edited 2d array?

Question

May I know how do i edit a constant 2D array variable upon meeting certain conditions and then save into the variable for processing later ? Currently, with the code below, I was unable to store my data in userInput into the column variable.

When i print BOARD, the values are still unchanged ! How will i be able to traverse the 2D array as shown below and edit certain elements and save them back into the variable BOARD?

The source code is below :

for row in BOARD:

    if userInput not in row:
        userInput = raw_input ("Please enter a character into the program")
    if userInput in row:
        for column in row:
            if userInput != column:
                print column
                print userInput
                column = userInput
                break

Related: [How to modify list entries during for loop?](http://stackoverflow.com/questions/4081217/how-to-modify-list-entries-during-for-loop) — Ashwini Chaudhary, Oct 12 '14 at 14:56

score 2 · Accepted Answer · edited May 23 '17 at 10:25

2

You can store them back with their corresponding indices, which are got with enumerate function, like this

for i, row in enumerate(BOARD):
    ...
    ...
    for j, column in enumerate(row):
        ...
        BOARD[i][j] = userInput
        ...

In this case, since you are altering the row, you can drop the outer enumerate, like Ashwini Chaudhary suggested in the comments

for row in BOARD:
    ...
    ...
    for i, column in enumerate(row):
        ...
        row[i] = userInput
        ...

edited May 23 '17 at 10:25

Community

1
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answered Oct 12 '14 at 14:56

thefourtheye

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I think we can drop the outer enumerate call since `row` is simply a reference to the inner list and use `row[j] = ...` – Ashwini Chaudhary Oct 12 '14 at 14:59
works like a charm ! absolutely brillant ! thanks mate ! – misctp asdas Oct 12 '14 at 15:01
@AshwiniChaudhary Thanks man, I included your suggestion in the answer :-) – thefourtheye Oct 12 '14 at 15:02

How to edit the elements of a 2d array and display the edited 2d array?

1 Answers1