#实验三
from turtle import *
# 绘制正方形
# 参数size指定边长，rgb指定画笔颜色
# 如果没有给参数，采用默认值
def square(size=50, rgb = 'orange'):
    pencolor(rgb)
    for i in range(4):
        fd(size)
        left(90)
def main():
    setup(800, 600)
    speed(0)
    for i in range(10):
        square(80)
        left(36)
    hideturtle()
    done()
if __name__ == '__main__':
    main()

#实验四
from turtle import *
setup(800, 600)
pencolor('pink')
speed(4)
for i in range(10):
    for i in range(2):
        circle(80, 90)
        left(90)
    right(36)
hideturtle()
done()

#实验五
from turtle import *
speed(0)
setup(800, 600)
bgcolor('black')
pencolor('white')
angle = 0
size = 2
for i in range(10):
    for j in range(4):
        fd(size)
        angle += 72
        seth(angle)
        size += 5
hideturtle()
done()

#实验六
from turtle import *
import random
setup(800, 600)
def moveto(x=20):
    penup()
    fd(x)
    pendown()
def square(y=20):
    for i in range(2):
        fd(20)
        left(90)
        fd(40)
        left(90)
moveto(-200)
for i in range(20):
    rgb = tuple(random.random() for i in range(3))
    fillcolor(rgb)
    begin_fill()
    square()
    end_fill()
    moveto()
done()