作业3

1.画五角星

import turtle
turtle.color('yellow')
turtle.fillcolor('yellow')
turtle.begin_fill()
for i in range(5):

    turtle.forward(200)
    turtle.right(144)
    turtle.end_fill()

2.画同心圆

import turtle
for i in range(5):
turtle.up()
turtle.goto(0,-20*(i+1))
turtle.down()
turtle.circle(20*(i+1))
turtle.write(10-i)

3.画太阳花

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

4.画五个五角星

import turtle

turtle.color('yellow')
turtle.fillcolor('yellow')
turtle.bgcolor('red')

def Igoto(x,y):
turtle.up()
turtle.goto(x,y)
turtle.down()
return

turtle.begin_fill()
Igoto(-200,200)
for i in range(5):
turtle.forward(100)
turtle.right(144)
turtle.end_fill()

turtle.begin_fill() 
Igoto(-100,250)
for i in range(5):
turtle.forward(20)
turtle.right(144)
turtle.end_fill()

turtle.begin_fill()
Igoto(-100,200)
for i in range(5):
turtle.forward(20)
turtle.right(144)
turtle.end_fill()

turtle.begin_fill() 
Igoto(-100,150)
for i in range(5):
turtle.forward(20)
turtle.right(144)
turtle.end_fill()

turtle.begin_fill()
Igoto(-100,100)
for i in range(5):
turtle.forward(20)
turtle.right(144)

turtle.end_fill()