I'm generating cubes with this code:
    
    for a in range(10):
        x = random.randint(-5, 4)
        y = random.randint(-2, 7)
        z = random.randint(3, 10)
        bpy.ops.mesh.primitive_cube_add(location=(x,y,z), radius = 1)`

What do I add to make sure no one of these 10 cubes are created with some part of it inside of one of the earlier created cubes?