使用python编写彩色圆圈

环境：

pygame zero

import pgzrun
import random

R=100
def draw():

    screen.fill('white')
    for y in range(R,600,2*R):
        for x in range(R, 800, 2*R):
            for r in range(R,0,-10):
                screen.draw.filled_circle((x, y), r, (random.randint(0, 255), random.randint(0, 255), random.randint(0, 255)))


def on_mouse_down():
    draw()


pgzrun.go()