def display_menu(self, a):
if (a[1] == "Login"):
obj = Welcome()
obj.Readfile()
obj.user_check()
elif (a[1] == "Menu"): # If user write 1 goto the Menu class.
obj1 = Menu()
obj1.Readfile()
obj1.menu_display()
elif (a[1] == "Cart"): # If user write 2 goto the cart class.
obj2 = Cart()
obj2.Read_file()
obj2.select(sys.argv)
obj2.cart_display(sys.argv)
elif (a[1] == "Payment"): # If user write 3 goto the Payment class.
obj1 = Payment()
obj1.Read_file()
obj1.payment_display(sys.argv)
obj1.updateorder(sys.argv)
obj1.Bill_pay(sys.argv)
elif (a[1] == "Order"): # If user write 4 goto the Oreder class.
obj1 = Order()
obj1.Read_file()
obj1.order_display(sys.argv)
obj1.cancelorder(sys.argv)
