编辑版本：
我是Tkinter的新手，我想执行一个类似于这个问题的答案（Switch between two frames in tkinter?）的页面切换功能，但是，我不想将所有页面放在一个单独的. py文件中，我想从每个页面自己的. py文件中调用每个页面。
我想要这个的原因是，以后我将有多个子页面，每个子页面将代表不同的工具。
我的问题是，
当我的每个页面都从不同的python文件中调用时，我如何仍然保持相同的帧切换功能？
以下是我迄今为止尝试过的方法：
app.py

from page1 import *

import tkinter as tk
from tkinter import Tk, Frame, ttk
    

class AppWindow(Tk):
    def __init__(self, *args, **kwargs):
        Tk.__init__(self, *args, **kwargs)

        # create a container for all the widgets (buttons, etc)
        container = Frame(self)
        container.pack(side="top", fill="both", expand=True)
        container.grid_rowconfigure(0, weight=1)
        container.grid_columnconfigure(0, weight=1)

        self.frames = {}

        # for loops for switching between pages
        for F in (HomePage, PageOne, Tool1):
            frame = F(container, self)
            self.frames[F] = frame
            frame.grid(row=0, column=0, sticky="nsew")

        self.show_frame(HomePage)

    def show_frame(self, cont):
        frame = self.frames[cont]
        frame.tkraise()

class HomePage(Frame):
    def __init__(self, parent, controller):
        Frame.__init__(self, parent)

        label = ttk.Label(self, text="App Main Window", font=LARGE_FONT)
        label.pack(pady=10, padx=10)

        proc_btn = ttk.Button(self, text="Go to Page One",
                              command=lambda: controller.show_frame(PageOne))
        proc_btn.pack(ipadx=5, ipady=5, expand=1)

if __name__ == "__main__":
    app = AppWindow()
    app.mainloop()

page1.py

from apptest import *

import tkinter as tk
from tkinter import Tk, Frame, ttk

class PageOne(Frame):
    def __init__(self, parent, controller):
        Frame.__init__(self, parent)

        label = ttk.Label(self, text="Page One !!!!!!!!", font=LARGE_FONT)
        label.pack(pady=10, padx=10)

        proc1_btn = ttk.Button(self, text="Tool 1",
                               command=lambda: controller.show_frame(Tool1))
        proc1_btn.pack(ipadx=5, ipady=5, expand=1)

        home_btn = ttk.Button(self, text="Homepage",
                              command=lambda: controller.show_frame(HomePage))
        home_btn.pack(ipadx=5, ipady=5, expand=1)

class Tool1(Frame):
    def __init__(self, parent, controller):
        Frame.__init__(self, parent)

        label = ttk.Label(self, text="Tool 1 !!!!!!!!", font=LARGE_FONT)
        label.pack(pady=10, padx=10)

        # Find what
        ttk.Label(self, text='Find:')
        keyword = ttk.Entry(self, width=30)
        keyword.focus()
        keyword.pack(ipadx=5, ipady=5, expand=1)

        # Replace with:
        ttk.Label(self, text='Replace:')
        replacement = ttk.Entry(self, width=30)
        replacement.pack(ipadx=5, ipady=5, expand=1)

        proc1_btn = ttk.Button(self, text="PageOne",
                               command=lambda: controller.show_frame(PageOne))
        proc1_btn.pack(ipadx=5, ipady=5, expand=1)

        home_btn = ttk.Button(self, text="Homepage",
                              command=lambda: controller.show_frame(HomePage))
        home_btn.pack(ipadx=5, ipady=5, expand=1)

当我在"PageOne"和"Tool1"页面上尝试使用"HomePage"按钮返回主页时，出现问题。以下是我看到的错误。

Exception in Tkinter callback 
  Traceback (most recent call last):
     File "...\lib\tkinter\__init__.py", line 1705, in __call__ 
        return self.func(*args)   
     File "...\GUI\page1.py", line 21, in <lambda> 
        command=lambda: controller.show_frame(HomePage))
     File "C.../GUI/app.py", line 52, in show_frame 
        frame = self.frames[cont]

KeyError: <class 'apptest.HomePage'>

提前感谢您的帮助

• • 答案：**

这个问题的答案可以在这里找到：Switch between two frames in tkinter in separates files