coucou

import commands, osdef file_exists(fichier):   try:      file(fichier)      return True   except:      return Falsecommands.getoutput('wget http://www.lechuck.org/ifup')Ifup = file_exists(ifup)---iziBook:~/prog/python philemon$ python resetwifi.py Traceback (most recent call last):  File "resetwifi.py", line 13, in ?    Ifup = file_exists(ifup)NameError: name 'ifup' is not defined