058.GUIChellngeBetter.py

import tkinter

keys = [[('C',1),('CE',1)],
        [('7',1),('8',1),('9',1),('+',1)],
        [('4',1),('5',1),('6',1),('-',1)],
        [('1',1),('2',1),('3',1),('*',1)],
        [('0',1),('=',2),('/',1)],
       ]

mainWindowPadding = 8
mainWindow = tkinter.Tk()
mainWindow.title("Calculator")
mainWindow.geometry('640x480-8-200')
mainWindow['padx'] = mainWindowPadding

result = tkinter.Entry(mainWindow)
result.grid(row=0,column=0,sticky='nsew')

keypad = tkinter.Frame(mainWindow)
keypad.grid(row=1,column=0,sticky='nsew')

row=0
for keyRow in keys:
    col = 0
    for key in keyRow:
        tkinter.Button(keypad,text=key[0],height=3,width=6).grid(row=row,column=col,columnspan=key[1],sticky=tkinter.E+tkinter.W)
        col += key[1]
    row += 1

mainWindow.update()
mainWindow.minsize(keypad.winfo_width()+8+mainWindowPadding,result.winfo_height()+8+keypad.winfo_height())
mainWindow.maxsize(keypad.winfo_width()+8+mainWindowPadding,result.winfo_height()+8+keypad.winfo_height())
mainWindow.mainloop()