变大变小的海龟

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import turtle as t

t.fillcolor('blue')

cs=['red','blue','red','blue',
    'red','blue','red','blue']

i=0
while True:
    t.fillcolor(cs[i])
    i = i + 1
    i = i % 8

    c = 1
    while c0:
        t.shapesize(c)
        c = c - 1


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