#拐角方阵 n = 7 a = [ [0]*n for x in range(n) ] for i in range(n): for j in range(n): if i==j: #主对角线的元素 a[i][j] = i+1 for jj in range(j+1,n): a[i][jj] = i+1 a[j][jj] = i+1 for row in a: print(*row)