from turtle
import *
def isdrawing():
pendown
()
fd
(40)
def notdrawing():
penup
()
fd
(20)
Screen
().setup
(600,600,0,0)
for i
in range(1,5):
notdrawing
()
isdrawing
()
notdrawing
()
seth
(i
*90)
done
()
效果如下:
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