#五角星
from turtle import *
fillcolor("red")
begin_fill()
while True:
    forward(200)
    right(144)
    if abs(pos()) < 1:
        break
end_fill()

 1 from turtle import *
 2 fillcolor("red")
 3 begin_fill()
 4 while True:
 5     forward(100)
 6     right(-60)
 7     forward(100)
 8     right(120)
 9     if abs(pos()) < 1:
10         break
11 end_fill()