from Tkinter import *
def response(event):
    I = event.widget['text']
    
    texts = UPN.text.get(1.0,END+'-1c')
    #print texts

    if I == 'DEL':
        UPN.text.delete(INSERT + '-1c',INSERT)
    elif I == 'Clear':
        UPN.text.delete(1.0,END)
    elif I == 'Enter':
        PolishStyleGui.text.insert(INSERT,'\n')
    elif I == '=':
        s = toList(texts)
        #print s
        UPN.text.insert(END,'\n=\n')
        UPN.text.insert(END,suffixPolishStyle(s))
        UPN.text.see('end')
def UPN():    
    root.title('umgekehrte polnische Notation')
    root.resizable(False,False)
    root.geometry('400x500+200+100')

    UI = LabelFrame(root)
    UI.place(x = 1,y = 1,width = 398,height = 124)

    UPN.text = Text(UI)
    UPN.text.place(x=1,y=1,width=390,height=116)

    Li=[['7','8','9','+','DEL'],
        ['4','5','6','-','Enter'],
        ['1','2','3','*','='],
        ['0','00','.','/','Clear']]
 
    for i in range(len(Li[0])):
        for j in range(len(Li)):
            bt = Button(root)
            bt.place(x=(i+1)*60,y=120+(j+1)*60,width=50,height=50)
            bt['text'] = Li[j][i]
            bt.bind('<Button-1>',response,add=(root,))