python怎么跳转界面？

import wx

import pymysql,time,threading

from MySQL import Make_bill,function

class Withdrawal1(wx.App):

  def doClose(self,j):

    time.sleep(j)

    self.frame.Close()

  def __init__(self,YuanZhangH):

    self.YuanZhangH=YuanZhangH

    wx.App.__init__(self)

    self.frame = wx.Frame(parent=None,title='取 款',size=(535,450),style=wx.DEFAULT_FRAME_STYLE ^ wx.RESIZE_BORDER ^ wx.MAXIMIZE_BOX )

    panel=wx.Panel(self.frame,-1)

    label_pass = wx.StaticText(panel,-1,"取款金额:", pos=(80,200))

    #style 为设置输入

    self.JinE = wx.TextCtrl(panel,-1, size=(250,35), pos=(140,190))

    self.QueDing_button = wx.Button(panel, -1, "确    认", size=(80,60), pos=(120,280))

    self.QuXiao_button     = wx.Button(panel, -1, "反    回", size=(80, 60), pos=(340,280))

    self.QueDing_button.SetBackgroundColour('#0a74f7')

    self.QuXiao_button.SetBackgroundColour('#0a74f7')

    self.Bind(wx.EVT_BUTTON, self.QuK, self.QueDing_button)

    self.Bind(wx.EVT_BUTTON, self.QU, self.QuXiao_button)  #通过一个按钮触发界面跳转

    self.frame.Center()

    self.frame.Show(True)

  def QuK(self, event):

    pass

  def QU(self, event):

    t = threading.Thread(target=self.doClose, args=(0.05,))

    t.start()              #通过threading和doClose函数关闭界面

    jie = function.Jiemian(self.YuanZhangH) #打开新界面 

    jie.MainLoop()