如何在计时器上更改python customedraw文本？多么?

import wx

class MyFrame(wx.Frame):
    def __init__(self):
        wx.Frame.__init__(self, None, title="计时器示例")
        self.panel = wx.Panel(self)
        self.text = "初始文本"
        self.timer = wx.Timer(self)
        self.Bind(wx.EVT_TIMER, self.update_text, self.timer)
        self.timer.Start(1000)  # 每隔1秒触发一次定时器事件

    def update_text(self, event):
        # 在这里更新文本内容
        self.text = "更新后的文本"
        self.panel.Refresh()  # 刷新面板，触发自定义绘制函数的调用

    def on_paint(self, event):
        dc = wx.PaintDC(self.panel)
        dc.Clear()
        dc.DrawText(self.text, 10, 10)

app = wx.App()
frame = MyFrame()
frame.Show()
app.MainLoop()