from math import * #引用math数据库的全部函数
a=3.1415926
a=round(a,2)
print(a)


from random import * #随机数生成
from turtle import * #海龟绘图

setup(420,420,0,0)
goto(100,0)
circle(20) #画圈
done()

from turtle import *
color('red', 'yellow')
begin_fill()
while True:
    forward(200)
    left(170)
    if abs(pos()) < 1:
        break
end_fill()
done()