Testing Code

Will this format the code?

def diamond_square(m, x1, y1, x2, y2, r):

    """ Using standard python array.  No numpy

        Now x and y are backwards, though.

        m = any empty 2d array

        x1, y1, x2, y2 = range on m to apply calculations

        r = value range

    """

    i = ((m[x1][y1] + m[x1][y2] + m[x2][y1] + m[x2][y2]) // 4) + random.randint(-r,r)

    m[(x1+x2)//2]   [(y1+y2)//2] = i                         # Center

    m[x1]           [(y1+y2)//2] = i + random.randint(-r,r)  # Up

    m[x2]           [(y1+y2)//2] = i + random.randint(-r,r)  # Left

    m[(x1+x2)//2]   [y1]         = i + random.randint(-r,r)  # Right

    m[(x1+x2)//2]   [y2]         = i + random.randint(-r,r)  # Down

    if x2-x1 > 1 and y2-y1 > 1:

        diamond_square(m, x1,           y1,         (x1+x2)//2,     (y1+y2)//2, r//2)

        diamond_square(m, (x1+x2)//2,   y1,         x2,             (y1+y2)//2, r//2)

        diamond_square(m, x1,           (y1+y2)//2, (x1+x2)//2,     y2,         r//2)

        diamond_square(m, (x1+x2)//2,   (y1+y2)//2, x2,             y2,         r//2)