当需要此功能时，您要做的是通过将事件置于线程共享的队列中来安排要执行的事件。这样，在给定线程中，您可以通过排队指定要运行“
create（50，…）”，然后主线程将事件出队并执行它。
这是在第二个螺纹中创建运动球的基本示例：
import threadingimport Queueimport randomimport mathimport timeimport Tkinterrandom.seed(0)class App: def __init__(self, queue, width=400, height=300): self.width, self.height = width, height self.canvas = Tkinter.Canvas(width=width, height=height, bg='black') self.canvas.pack(fill='none', expand=False) self._oid = [] self.canvas.after(10, self.move) self.queue = queue self.canvas.after(50, self.check_queue) def check_queue(self): try: x, y, rad, outline = self.queue.get(block=False) except Queue.Empty: pass else: self.create_moving_ball(x, y, rad, outline) self.canvas.after(50, self.check_queue) def move(self): width, height = self.width, self.height for i, (oid, r, angle, speed, (x, y)) in enumerate(self._oid): sx, sy = speed dx = sx * math.cos(angle) dy = sy * math.sin(angle) if y + dy + r> height or y + dy - r < 0: sy = -sy self._oid[i][3] = (sx, sy) if x + dx + r > width or x + dx - r < 0: sx = -sx self._oid[i][3] = (sx, sy) nx, ny = x + dx, y + dy self._oid[i][-1] = (nx, ny) self.canvas.move(oid, dx, dy) self.canvas.update_idletasks() self.canvas.after(10, self.move) def create_moving_ball(self, x=100, y=100, rad=20, outline='white'): oid = self.canvas.create_oval(x - rad, y - rad, x + rad, y + rad, outline=outline) oid_angle = math.radians(random.randint(1, 360)) oid_speed = random.randint(2, 5) self._oid.append([oid, rad, oid_angle, (oid_speed, oid_speed), (x, y)])def queue_create(queue, running): while running: if random.random() < 1e-6: print "Create a new moving ball please" x, y = random.randint(100, 150), random.randint(100, 150) color = random.choice(['green', 'white', 'yellow', 'blue']) queue.put((x, y, random.randint(10, 30), color)) time.sleep(0) # Effectively yield this thread.root = Tkinter.Tk()running = [True]queue = Queue.Queue()app = App(queue)app.create_moving_ball()app.canvas.bind('<Destroy>', lambda x: (running.pop(), x.widget.destroy()))thread = threading.Thread(target=queue_create, args=(queue, running))thread.start()root.mainloop()
