loop 2d array python code example

Example 1: create a 2d array in python

def build_matrix(rows, cols):
    matrix = []

    for r in range(0, rows):
        matrix.append([0 for c in range(0, cols)])

    return matrix

if __name__ == '__main__':
    build_matrix(6, 10)

Example 2: two dimensional array python

# Creates a list containing 5 lists, each of 8 items, all set to 0
w, h = 8, 5;
Matrix = [[0 for y in range(h)] for x in range(w)] 

Matrix[0][0] = 1
Matrix[0][6] = 3 # error! range... 
Matrix[6][0] = 3 # valid

Example 3: how to use loop in 2d array

for (int row = 0; row < board.length; row++) { 
	for (int col = 0; col < board[row].length; col++) { 
    	board[row][col] = row * col; 
        } 
    }