需调试bug

tkinter 创建的屏保

• bug : 程序提示小球移动时最大递归深度超过限制

import random
import tkinter


class RandomBoll:
    def __init__(self, canvas, screen_width, screen_height):

        self.screenwidth = screen_width
        self.screenheight = screen_height
        self.canvas = canvas

        self.xPos = random.randint(10, int(self.screenwidth - 20))
        self.yPos = random.randint(10, int(self.screenheight - 20))
        self.xSpeed = random.randint(4, 20)
        self.ySpeed = random.randint(4, 20)
        self.radios = random.randint(20, 120)
        self.color = '#%02x%02x%02x' % (random.randint(0, 255),
                                        random.randint(0, 255),
                                        random.randint(0, 255))

    def create_ball(self):
        x1 = self.xPos - self.radios
        y1 = self.yPos - self.radios
        x2 = self.xPos + self.radios
        y2 = self.yPos + self.radios

        self.item = self.canvas.create_oval(x1, y1,
                                            x2, y2,
                                            fill=self.color,
                                            outline=self.color)

    def move_ball(self):
        self.xPos += self.xSpeed
        self.yPos += self.ySpeed

        if self.xPos + self.radios >= self.screenwidth or self.xPos < self.radios:
            self.xSpeed = -self.xSpeed
        if self.yPos + self.radios >= self.screenheight or self.yPos < self.radios:
            self.ySpeed *= -1

        self.canvas.move(self.item, self.xSpeed, self.ySpeed)


class ScreenSaver:
    balls = list()

    def __init__(self):
        self.numBalls = random.randint(6, 20)
        self.root = tkinter.Tk()
        self.root.overrideredirect(1)
        self.root.bind('<Motion>', self.my_quit)
        w, h = self.root.winfo_screenwidth(), self.root.winfo_screenheight()
        self.canvas = tkinter.Canvas(self.root, width=w, height=h)
        self.canvas.pack()

        for i in range(self.numBalls):
            ball = RandomBoll(self.canvas, screen_width=w, screen_height=h)
            ball.create_ball()
            self.balls.append(ball)

        self.run_screen_saver()
        self.root.mainloop()

    def run_screen_saver(self):
        for ball in self.balls:
            ball.move_ball()
        self.canvas.after(200, self.run_screen_saver())

    def my_quit(self, e):
        self.root.destroy()


if __name__ == '__main__':
    ScreenSaver()

代码调试报错：

C:\Users\Administrator\AppData\Local\Programs\Python\Python37\python3.7.exe E:/Python_work/ziqizhan/ScreenSaver.py
Traceback (most recent call last):
  File "E:/Python_work/ziqizhan/ScreenSaver.py", line 74, in <module>
    ss = ScreenSaver()
  File "E:/Python_work/ziqizhan/ScreenSaver.py", line 61, in __init__
    self.run_screen_saver()
  File "E:/Python_work/ziqizhan/ScreenSaver.py", line 67, in run_screen_saver
    self.canvas.after(200, self.run_screen_saver())
  File "E:/Python_work/ziqizhan/ScreenSaver.py", line 67, in run_screen_saver
    self.canvas.after(200, self.run_screen_saver())
  File "E:/Python_work/ziqizhan/ScreenSaver.py", line 67, in run_screen_saver
    self.canvas.after(200, self.run_screen_saver())
  [Previous line repeated 991 more times]
  File "E:/Python_work/ziqizhan/ScreenSaver.py", line 66, in run_screen_saver
    ball.move_ball()
  File "E:/Python_work/ziqizhan/ScreenSaver.py", line 41, in move_ball
    self.canvas.move(self.item, self.xSpeed, self.ySpeed)
  File "C:\Users\Administrator\AppData\Local\Programs\Python\Python37\lib\tkinter\__init__.py", line 2591, in move
    self.tk.call((self._w, 'move') + args)
RecursionError: maximum recursion depth exceeded while calling a Python object

Process finished with exit code 1