Why do I have an infinite loop?

[Windspar]

I can make no sense of that code. Also, it imports two modules I've never even heard of.

You really need to learn python. Then dive into pygame.

def draw_color(surface, x, y, color, c_range, block):
    # Save y enter location.
    y_top = y

    # Create 3 ranges. 
    red = range(color.r, -1, -c_range)      # range(start, end, step)
    green = range(color.g, -1, -c_range)
    blue = range(color.b, -1, -c_range)

    # Product just let you loop through all 3 ranges in one line.
    for r, g, b in product(red, green, blue):
        pygame.draw.rect(surface, (r, g, b), (x, y, block, block))
        y += block

        # y is greater than block time four plus y start point.
        if y > block * 4 + y_top:
            x += block
            # Reset y back to start location.
            y = y_top