from turtle import *
for i in range(4):
    fd(100)
    rt(90)
    circle(-100,45)
    goto(0,0)
    lt(45)    
done()

# -*- coding: utf-8 -*-
"""
Created on Fri Nov  5 09:39:06 2021

@author: SBM
"""
from turtle import *
from random import random
rt(22.5)
for i in range(4):
    fillcolor(random(),random(),random())  #填充颜色
    begin_fill()    #填充开始
    fd(100)
    rt(90)    
    circle(-100,45)
    goto(0,0)
    end_fill()      #填充结束
    lt(45)
width(5)
goto(0,-200)
done()

from turtle import *
import time
setup(1024,768)
rt(90)
for i in range(8):
    fd(100)
    lt(90)
    circle(-100,45)
    goto(0,0)
    rt(90)   
done()