while循环与for循环

import turtle
turtle.setup(600,400,0,0)
turtle.bgcolor('black')
turtle.color('white')
turtle.fillcolor('white')

def mygoto(x,y):
    turtle.penup()
    turtle.goto(x,y)
    turtle.pendown()

def draw5star(r):
    turtle.begin_fill()
    for i in range(5):
        turtle.forward(r)
        turtle.right(144)
    turtle.end_fill()


mygoto(-250,100)
draw5star(50)

mygoto(-100,125)
draw5star(20)

mygoto(-50,100)
draw5star(20)

mygoto(-70,50)
draw5star(20)

mygoto(-100,0)
draw5star(20)



turtle.done()

import turtle

while True:
    turtle.forward(100)
    turtle.right(68)
    if (abs(turtle.pos()))<1:
        break
turtle.done()