#!/usr/bin/python
# coding: utf8

import pickle
import sys

contenu = {}
new = {}
statut = True

def charger(fic):
	global contenu
	try:
		with open(fic, "rb") as fichier:
			loader = pickle.Unpickler(fichier)
			contenu = loader.load()
	except:
		contenu = {}

def sauver(fic):
	with open(fic, "wb") as fichier:
			saver = pickle.Pickler(fichier)
			saver.dump(contenu)

if (len(sys.argv) is 4):
	charger(sys.argv[1])
	try:
		for cle in contenu:
			if (cle == sys.argv[2]):
				print(cle)
				new[sys.argv[3]] = contenu[cle]
			else:
				new[cle] = contenu[cle]
	except Exception as err:
		print(err)
		statut = False

	if (statut):
		contenu = new
		sauver(sys.argv[1])
else:
	print("lecture.py <fichier> <salon_orig> <salon_dest>")