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彩虹代码如下：

import pgzrun

indigo = '#4B0082'#indigo为靛色

def draw():

    color = ['red', 'orange', 'yellow', 'green', 'blue', indigo, 'purple', 'white']
    screen.fill('white')
    for r in range(8):
        screen.draw.filled_circle((400,600),400-r*30,color[r])

pgzrun.go()