tkinter旋转的二维码

import time
from tkinter import *
from PIL import Image,ImageTk

root = Tk()
root.title('旋转的二维码')

cv = Canvas(root,width=600,height=600,bg='cyan')
cv.pack()

im = Image.open('python侠二维码.jpg').convert('RGBA')
pic = ImageTk.PhotoImage(im)
erweima = cv.create_image(300,300,image=pic)

a = 1
while True:
    im2 = im.rotate(a,expand=True)
    ma = ImageTk.PhotoImage(im2)
    cv.itemconfig(erweima,image=ma)
    a += 1
    cv.update()
    time.sleep(0.01)