#!/usr/bin/python3

import sys

#print ("Nom du programme : ", sys.argv[0])
#print ("Nombre d'arguments: ", len(sys.argv))
#print ("Les arguments sont : " , str(sys.argv))

if len(sys.argv) != 2:
        msg= ("Usage : " + sys.argv[0] + " <fichier.txt>")
        print(msg ,file=sys.stderr)
        sys.exit(1)

filename = sys.argv[1]
try:
        file= open(filename , "r")
except:
        msg = ("Erreur ouverture fichier " + filename)
        print(msg ,file=sys.stderr)

else:
        line = file.readline()
        linee = line.rstrip()
        while linee:
                (login, complet) = linee.split(":")
                print (login, " ",complet)
                line = file.readline()
                linee = line.rstrip()
        file.close()