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,(

	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,

	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,

	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,

	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()