Python Tkinter旋转图像动画

我有一张用PIL创建的照片，然后添加到TKinter画布上。图像显示得很好。但是，我无法使PIL rotate函数正常工作。这是我的密码：

 #This works fine
 image = Image.open('img.png')
 canvas_image = ImageTk.PhotoImage(rotated_image)
 canvas_object = canvas.create_image(30+10*int(steps),250, image=canvas_image)
 canvas.pack()

 #this does not work
 canvas.delete(canvas_object)
 rotated_image = image.rotate(1)
 canvas_image = ImageTk.PhotoImage(rotated_image)
 canvas_object = canvas.create_image(30+10*int(steps),250, image=canvas_image)
 canvas.update()

但是，在这种情况下，图像不会显示出来。我想能够动画的图像旋转，但我甚至不能得到一个旋转工作在所有！如有任何建议，我们将不胜感激

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编辑：更正，旋转在已添加到屏幕后将不起作用

以下是使用Python3旋转图像的示例：

import tkinter as tk
from PIL import ImageTk
from PIL import Image

class SimpleApp(object):
    def __init__(self, master, filename, **kwargs):
        self.master = master
        self.filename = filename
        self.canvas = tk.Canvas(master, width=500, height=500)
        self.canvas.pack()

        self.update = self.draw().__next__
        master.after(100, self.update)

    def draw(self):
        image = Image.open(self.filename)
        angle = 0
        while True:
            tkimage = ImageTk.PhotoImage(image.rotate(angle))
            canvas_obj = self.canvas.create_image(
                250, 250, image=tkimage)
            self.master.after_idle(self.update)
            yield
            self.canvas.delete(canvas_obj)
            angle += 10
            angle %= 360

root = tk.Tk()
app = SimpleApp(root, '/path/to/image.png')
root.mainloop()

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对于Python2版本，请参见上面的。

以下是unutbu的答案，但在Python3中：

import time
import tkinter
from PIL import Image, ImageTk

class SimpleApp(object):
    def __init__(self, master, filename, **kwargs):
        self.master = master
        self.filename = filename
        self.canvas = tkinter.Canvas(master, width=500, height=500)
        self.canvas.pack()

        self.process_next_frame = self.draw().__next__  # Using "next(self.draw())" doesn't work
        master.after(1, self.process_next_frame)

    def draw(self):
        image = Image.open(self.filename)
        angle = 0
        print(self.process_next_frame)
        while True:
            tkimage = ImageTk.PhotoImage(image.rotate(angle))
            canvas_obj = self.canvas.create_image(250, 250, image=tkimage)
            self.master.after_idle(self.process_next_frame)
            yield
            self.canvas.delete(canvas_obj)
            angle += 1
            angle %= 360
            time.sleep(0.002)

root = tkinter.Tk()
app = SimpleApp(root, 'images.png')
root.mainloop()

我花了一段时间才开始工作，所以我想我会和大家分享