如何从另一个类更新tkinter小部件图像？

Question

我正在创建一个多帧tkinter应用程序，并且希望用户在一个帧子类上输入内容以更新在另一个帧子类小部件上显示的图像。

唯一能够更新图像的方法是通过.config（）。我知道松散或紧密的耦合是答案，我在执行时遇到了麻烦。

目标：从另一个子类更改“按钮”图片

from tkinter import *

class GUI(Tk):  # Main Tk SubClass
    def __init__(self, *args, **kwargs):
        Tk.__init__(self, *args, **kwargs)

        # Photo Instances
        self.PI1= PhotoImage(file='Image1.png')
        self.PI2= PhotoImage(file='Image2.png')

        # Frame Control
        container = Frame(self)  
        container.grid_rowconfigure(0, weight=1)
        container.grid_columnconfigure(0, weight=1)
        container.pack(side="top",fill="both", expand=1)

        self.frames = {}

        for F in (Page_1, Page_2):
            page_name = F.__name__
            frame = F(parent=container, controller=self)
            self.frames[page_name] = frame

            frame.grid(row=0, column=0, sticky="nsew")

        self.showFrame("Page_1")


    def showFrame(self, page_name):
        frame = self.frames[page_name]
        frame.tkraise()


class Page_1(Frame): # I/P SubClass
    def __init__(self, parent, controller):
        Frame.__init__(self, parent)
        self.controller = controller


        def Input():
            # Page_2.tbut.config(image='pyimage2') ?????
            pass

        Button(self, text='ChangeImage', command =lambda: Input()).pack()


        #Access Page 2
        Button(self, text='Go to Page 2', command=lambda: self.controller.showFrame("Page_2")).pack()



class Page_2(Frame): # O/P SubClass                                                             
    def __init__(self, parent, controller):
        Frame.__init__(self, parent)
        self.controller = controller

        self.tbut=Button(self, image='pyimage1', height=45, width=45)
        self.tbut.pack()

        #Access Page 1
        Button(self, text='Go to Page 1', command=lambda: self.controller.showFrame("Page_1")).pack()

app = GUI()
app.mainloop()

非常感谢您的帮助！