在python中用Graphics繪圖怎么上色？

# coding:utf8

from Graphics import *

win = GraphWin()

pt = Point(75, 50) # 設定圓心

pt.draw(win)

cir = Circle(Point(150, 50), 25) # 設定圓形

cir.draw(win)

cir.setFill('blue') # 給圓形上色

cir = Circle(pt, 25) # 設定圓形

cir.draw(win)

cir.setFill('blue') # 給圓形上色

retl = Rectangle(pt,Point(150,100)) # 設定矩形

retl.draw(win)

retl.setFill('blue') # 給矩形上色

import time

time.sleep(5)