1.彩色螺旋線

from turtle import *
import turtle
t = Turtle()
t.pensize(2)
turtle.bgcolor("black")
colors = ["red", "yellow", 'purple', 'blue']
t._tracer(False)
for x in range(400):
    for y in range(200):
        t.forward(x * y)
        t.color(colors[x % 4])
        t.left(91)
t._tracer(True)
done()

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