tkinter 奇妙的突然无法修改Text对象问题

问题描述：

使用tkinter的Text对象建立一个self.text_screen对象
可以通过如下代码的前半部分刷新为“是否打印清单”，但后面函数却始终无法二次刷新。（确实执行了注册的函数）详细如下：（pycharm）

def print_deal_list_state(self):

self.text_screen['state']=NORMAL
self.text_screen.delete('1.0',END)
self.text_screen.insert('1.0',('\n\n\t是否打印交易清单？'))

self.text_screen['state']=DISABLED
self.btn_deposit['state']=DISABLED
self.btn_transfer['state']=DISABLED
self.btn_withdraw['state']=DISABLED

def ending_thanking():

self.text_screen['state']=NORMAL
self.text_screen.delete('1.0',END)
self.text_screen.insert('1.0','\n\n\t谢谢惠顾！')
#time.sleep(2)
self.main_state()

def press_ok():
#print('hi?')
self.text_screen['state']=NORMAL
self.text_screen.delete('1.0',END)
self.text_screen.insert('1.0','\n\n\t请稍等，打印中...')

# time.sleep(2)#wait 2 second to simulate the process

self.text_screen.delete('1.0',END)
self.text_screen.insert('1.0','\n\n\t打印完毕')

ending_thanking()

def press_cancel():
ending_thanking()

self.btn_ok.configure(command=lambda *args:self.press_ok())
self.btn_cancel.configure(command=lambda *args:self.press_cancel())

解决方法：

同一个调用里，两次对Text插件进行插入删除，中间没有更新

self.text_screen.update()