import turtle as t
import colorsys

# 绘制平行四边形
def pingxing():     
    for j in range(2):
        t.forward(100)
        t.right(60)
        t.forward(200) 
        t.right(120)

t.tracer(10)
t.bgcolor('black')
t.pensize(3)
h = 0

while True:
    c = colorsys.hsv_to_rgb(h,1,1)   
    h += 0.005
    if h > 1 :
        h = 0    
    t.pencolor(c)
    t.fillcolor('black')
    t.begin_fill()
    pingxing()
    t.end_fill()
    t.right(12)        
    
t.done()