remi@olaf $ ./parse.py -h
Before parsing
usage: parse.py [-h] [-v] [-f Fichier] [-n NUM]

Message d'aide

optional arguments:
  -h, --help            show this help message and exit
  -v, --verbose         Be more verbose
  -f Fichier, --file FILE
                        File to handle
  -n NUM                Line number

remi@olaf $ ./parse.py -f Pif
Before parsing
After parsing
Valeurs : False, 'pif', None

remi@olaf $ ./parse.py -f Pif -n
Before parsing
usage: parse.py [-h] [-v] [-f Fichier] [-n NUM]
parse.py: error: argument -n: expected one argument
