platforms and because it is implemented with classesit is both standalone program and reusable object library simple calculator gui before show you how to write full-blown calculatorthoughthe module shown in example - starts this discussion in simpler terms it implements limited calculator guiwhose buttons just add text to the input field at the top in order to compose python expression string fetching and running the string all at once produces results figure - shows the window this module makes when run as top-level script example - pp \lang\calculator\calc py " simplistic calculator guiexpressions run all at once with eval/execfrom tkinter import from pp gui tools widgets import framebuttonentry class calcgui(frame)def __init__(selfparent=none)frame __init__(selfparentself pack(expand=yesfill=bothself master title('python calculator 'self master iconname("pcalc "self names {text stringvar(entry(selftoptextan extended frame on default top-level all parts expandable frames plus entry namespace for variables rows ["abcd"" "" "" ()"for row in rowsfrm frame(selftopfor char in rowbutton(frmleftcharlambda char=chartext set(text get(char)frm frame(selftopfor char in "+-*/="button(frmleftcharlambda char=chartext set(text get()char ')frm frame(selfbottombutton(frmleft'eval'lambdaself eval(textbutton(frmleft'clear'lambdatext set(''def eval(selftext)trytext set(str(eval(text get()self namesself names))except syntaxerrortryexec(text get()self namesself namesexcept text and language was '