#!/usr/bin/env python
# -*- coding: utf-8 -*-
from tkinter import *   

def click ():
   print (value.get())
   label2["text"]+=value.get()+"\r"

def click_reset ():
    print ("exit")
    fenetre.quit
    label2["text"]=""
    fenetre.mainloop

def check_channel(numero):
        return {
        'a': 1,
        'b': 2
        }.get(numero, "chaine inconnue") 


fenetre = Tk()
value = StringVar()
value.set("texte par défaut")
entree = Entry(fenetre, textvariable=value, width=30)
frame =Frame(fenetre)
label = Label(fenetre, text="entrer text    ")
label2=Label(fenetre, text="")
bouton=Button(frame, text="OK", command=click)
reset=Button(frame, text="reset",command=click_reset)

label.pack()
entree.pack()
frame.pack()
bouton.pack(side = LEFT)
reset.pack(side = RIGHT)
label2.pack()
fenetre.mainloop()