import turtle

创建画笔

pen = turtle.Turtle()

设置画笔宽度

pen.width(3)

设置画笔颜色

pen.color("blue")

设置初始半径

radius = 20

绘制5个同心圆

for i in range(5): pen.penup() pen.goto(0, -radius) pen.pendown() pen.circle(radius) radius += 20

隐藏画笔

pen.hideturtle()

显示绘图窗口

turtle.done()