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    <p>The code above works perfectly. It makes <code>make_computer_move(board, avail_col)</code> to return the column number, when a given columns is filled, to main. In main this column is taken out before calling again make_computer_board:</p> <pre><code>import random def display_board(board): col = " " cols = len(board[0]) for index1 in range(cols): col += "%i " % index1 print col for index2 in range(len(board)): print str(index2) + ": " + " | ".join(board[index2]) + " |" print " " + "---+" * cols def make_computer_move(board, avail_cols): col = random.choice(avail_cols) for row in range(len(board)-1, -1, -1): # counts from bottom of board and up if board[row][col] == " ": # if there is a blank space, put a "O" and break print "The pairing is (%i,%i)" % (row,col) #Print the coordinates board[row][col] = 'O' break if row == 0: #arrives to the last row return col def main(): board = [[" ", " ", " ", " ", " "] for i in range(5)] avail_cols = range(len(board[0])) display_board(board) for counter in range(25): filled = make_computer_move(board, avail_cols) display_board(board) if filled is not None: avail_cols.remove(filled) main() </code></pre> <p>Note:</p> <ol> <li>random import is now at the top.</li> <li>Code has been beautified a bit following PEP-8.</li> <li>I prepare the board with a list comprehension</li> <li>The two calls to <code>display_board(board)</code>. First one draw starting step, the secon one has been moved after <code>make_computer_move</code> to draw the last figure after the program is finish</li> <li>The use of % interpolations to simplify some lines</li> </ol> <p>There are still some inefficiencies. For example you calculate <code>len(board[0])</code> each time you call the function when this is not neccesary as the board stays always with the same size.</p>
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