python - Create a black and white chessboard in a two dimensional array -

is there better (and shorter) way of how create chessboard array. requirements board are:

• board can different size (in example it's 3x3)
• bottom left square of board should black
• black square presented "b", white square presented "w"

code have:

def iseven(number):     return number % 2 == 0  board = [["b" x in range(3)] x in range(3)] if iseven(len(board)):     rowindex, row in enumerate(board):         if iseven(rowindex + 1):             squareindex, square in enumerate(row):                 if iseven(squareindex + 1):                     board[rowindex][squareindex] = "w"         else:             squareindex, square in enumerate(row):                 if not iseven(squareindex + 1):                     board[rowindex][squareindex] = "w" else:     rowindex, row in enumerate(board):         if not iseven(rowindex + 1):             squareindex, square in enumerate(row):                 if iseven(squareindex + 1):                     board[rowindex][squareindex] = "w"         else:             squareindex, square in enumerate(row):                 if not iseven(squareindex + 1):                     board[rowindex][squareindex] = "w"  row in board:     print row 

output:

['b', 'w', 'b'] ['w', 'b', 'w'] ['b', 'w', 'b'] 

how about:

>>> n = 3 >>> board = [["bw"[(i+j+n%2+1) % 2] in range(n)] j in range(n)] >>> print board [['b', 'w', 'b'], ['w', 'b', 'w'], ['b', 'w', 'b']] >>> n = 4 >>> board = [["bw"[(i+j+n%2+1) % 2] in range(n)] j in range(n)] >>> print board [['w', 'b', 'w', 'b'], ['b', 'w', 'b', 'w'], ['w', 'b', 'w', 'b'], ['b', 'w', 'b', 'w']]