a = new = [[11,12,13],[21,22,23],[31,32,33]]
x = 1
y = 0
for i in range(3):
    for j in range(3):
        if j == x:
            new[i][j] = a[i][y]
        if j == y:
            new[i][j] = a[i][x]
        else:
            new[i][j] = a[i][j]
for row in new:
    print(' '.join([str(elem) for elem in row]))

 a = [[11,12,13],[21,22,23],[31,32,33]]
new = [[0] * 3 for i in range(3)]
x = 1
y = 0
for i in range(3):
    for j in range(3):
        if j == x:
            new[i][j] = a[i][y]
        if j == y:
            new[i][j] = a[i][x]
        else:
            new[i][j] = a[i][j]
for row in new:
    print(' '.join([str(elem) for elem in row]))

 a = [[11,12,13],[21,22,23],[31,32,33]]
x, y = 1, 0
for i in a:
    i[x], i[y] = i[y], i[x]

 >>> x=[[1,2,3], [4,5,6],[7,8,9]]
>>> i, j=1, 2
>>> x[i], x[j] = x[j], x[i]
>>> x
[[1, 2, 3], [7, 8, 9], [4, 5, 6]]