import turtle as t

import time

def init():

time.sleep(2)

t.clear()

t.seth(90)

t.penup()

t.goto(0,0)

t.pendown()

t.speed(0)

colors=["red","green","yellow","blue"]

# 嵌套圆

for i in range(1,100):

t.pencolor(colors[i%4])

t.circle(i)

t.left(91)

# 四叶草

init()

t.color("green")

t.begin_fill()

for i in range(4):

t.circle(-100,180)

t.right(90)

t.end_fill()

# 四色方框

init()

for i in range(100):

t.left(90)

t.pencolor(colors[i%4])

t.forward(i*3)

# 蚊香

init()

t.pensize(15)

t.pencolor('black')

for i in range(10):

t.circle(i*15,180)

t.done()

t.hideturtle()