SampleApp.py

import tkinter as tk
import MenuPage
import ctypes
import NewShopping
import BestCustomer
import FindCustomer
import Invoice_history
import ProdUpdate

class SampleApp(tk.Tk):
	ctypes.windll.shcore.SetProcessDpiAwareness(1)
	def __init__(self, *args, **kwargs):
		tk.Tk.__init__(self, *args, **kwargs)
		container = tk.Frame(self)
		container.pack(side="top", fill="both" ,expand=True)
		container.grid_rowconfigure(0, weight =1)
		container.grid_columnconfigure(0, weight=1)
		self.frames = {}

		#Add newly added pages here in for loop
		for F in (ProdUpdate.prod_update,Invoice_history.invoice_history,FindCustomer.find_customer,BestCustomer.best_customer_page,NewShopping.New_shopping_page,MenuPage.MenuPage):
			page_name = F.__name__
			frame = F(parent=container, controller=self)
			self.frames[page_name] = frame
			frame.grid(row=0, column=0, sticky="nsew")
		self.show_frame("MenuPage")# Add the page Name which you want to show when the app start's.
	def show_frame(self, page_name):
		frame = self.frames[page_name]
		frame.tkraise()  

if __name__ == "__main__":
    app = SampleApp() #Calling the App class
    app.mainloop() #helding the main class in loop to keep our ui responsive