Indlæse tal fra ascii-filer i python?

Kode 

import os
import sys
import string

if not sys.argv[1:] :
   print "You must specify input and output files"
   sys.exit()

try :
   inFile = open(sys.argv[1], 'rt')
except :
   print "Failed to open file"
   sys.exit()

Cont = True

while Cont :
   try :
      line = inFile.readline()
      words = string.split(line)
      n1 = int(words[0])
      n2 = int(words[1])
      print str(n1) + " + " + str(n2) + " = " + str(n1 + n2)
   except :
      Cont = False

inFile.close()