PYTHON CODE: import os from subprocess import call import sys try: from Tkinter import * except ImportError: from tkinter import * try: import ttk py3 = False except ImportError: import tkinter.ttk as ttk py3 = True def click_checkinn(): call(["python", "checkin_gui_and_program.py"]) def click_list(): call(["python", "listgui.py"]) def click_checkout(): call(["python", "checkoutgui.py"]) def click_getinfo(): call(["python","getinfoui.py"]) class HOTEL_MANAGEMENT: def __init__(self): root = Tk() '''This class configures and populates the toplevel window. top is the toplevel containing window.''' _bgcolor = '#d9d9d9' # X11 color: 'gray85' _fgcolor = '#000000' # X11 color: 'bl...