una tienda de videojuegos con tkinter bastante extenso

def tienda():
    from tkinter import *
    from tkinter import messagebox
    from tkinter import simpledialog
    from tkinter import filedialog
    from tkinter.ttk import *
    import os
    import math
    import sys
    import fileinput
    from tkinter.ttk import Combobox
    from tkinter.ttk import Progressbar
    from tkinter.ttk import Notebook
    from tkinter.ttk import Separator
    from tkinter.ttk import Treeview
    from tkinter.ttk import Frame
    from tkinter.ttk import Scrollbar
    from tkinter.ttk import Label
    from tkinter.ttk import LabelFrame
    from tkinter.ttk import Button
    from tkinter.ttk import Checkbutton
    from tkinter.ttk import Entry
    from tkinter.ttk import Radiobutton
    from tkinter.ttk import Menu
    from tkinter import *
    from t