This tutorial will teach you  to make a small Fish shop Inventory  system using python. The following  system will use to manage the Fish shop. import tkinter as tk OptionList = [ "kg", "gm", ] def Ok(): item = variable.get() result = float(e1.get()) if item == "kg": tot = result * 120 else : tot = result/1000 * 120 nsalText.set(tot) …