#彩色螺旋线
import turtle
import time
turtle.pensize(2)
turtle.bgcolor("black")
colors = ["red", "yellow",'purple','blue']
turtle.tracer(False)
for x in range(400):
    turtle.forward(2*x)
    turtle.color(colors[x % 4])
    turtle.left(91)
turtle.tracer(True)

在用Sublime Text 3.2调用Turtle画图时，运行上面的代码显示彩色螺旋线画面一闪而过。

最后加上一句turtle.done()即可解决

#彩色螺旋线
import turtle
turtle.pensize(2)
turtle.bgcolor("black")
colors = ["red","yellow","purple","blue"]
turtle.tracer(False)
for x in range(400):
    turtle.forward(2*x)
    turtle.color(colors[x % 4])
    turtle.left(91)
turtle.tracer(True)
turtle.done()

效果如下：