Tkinter Application to Switch Between Different Page Frames in Python

import tkinter as tk

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

        # Create a container to hold the frames
        container = tk.Frame(self)
        container.pack(side="top", fill="both", expand=True)
        container.grid_rowconfigure(0, weight=1)
        container.grid_columnconfigure(0, weight=1)

        # Create a dictionary to store different page frames
        self.frames = {}

        # Define the pages and add them to the frames dictionary
        for PageClass in (StartPage, PageOne, PageTwo):
            page_name = PageClass.__name__
            frame = PageClass(parent=container, controller=self)
            self.frames[page_name] = frame

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

        # Show the initial page
        self.show_frame("StartPage")

    def show_frame(self, page_name):
        # Show the requested page by raising it to the top
        frame = self.frames[page_name]
        frame.tkraise()

class StartPage(tk.Frame):
    def __init__(self, parent, controller):
        tk.Frame.__init__(self, parent)
        self.controller = controller
        label = tk.Label(self, text="Welcome to the Start Page")
        label.pack(pady=10, padx=10)
        button1 = tk.Button(self, text="Go to Page One", command=lambda: controller.show_frame("PageOne"))
        button2 = tk.Button(self, text="Go to Page Two", command=lambda: controller.show_frame("PageTwo"))
        button1.pack()
        button2.pack()

class PageOne(tk.Frame):
    def __init__(self, parent, controller):
        tk.Frame.__init__(self, parent)
        self.controller = controller
        label = tk.Label(self, text="This is Page One")
        label.pack(pady=10, padx=10)
        button = tk.Button(self, text="Go to Start Page", command=lambda: controller.show_frame("StartPage"))
        button.pack()

class PageTwo(tk.Frame):
    def __init__(self, parent, controller):
        tk.Frame.__init__(self, parent)
        self.controller = controller
        label = tk.Label(self, text="This is Page Two")
        label.pack(pady=10, padx=10)
        button = tk.Button(self, text="Go to Start Page", command=lambda: controller.show_frame("StartPage"))
        button.pack()

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