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from arcade import *

open_window(600, 400, 'rainbow')

set_background_color(color.WHITE)

# 列表：存储颜色
color_list = [color.RED, color.ORANGE, color.YELLOW, color.GREEN,
        color.BLUE, color.PURPLE, color.WHITE]

start_render()

i = 0

while i < 7:

    # 修改圆的半径,i增大的同时，r就会减小
    r = 300-i * 20
    # 画圆
    draw_circle_filled(300, 0, r, color_list[i])
    i = i+1

finish_render()
run()