PYTHON Search for words on URLS

import sys, requests as xsec
try:
        try:
                lst = open(sys.argv[1],'r').read().split("\n")
        except IOError:
                print 'LIST NOT FOUND !'
                sys.exit()

        for i in lst:
                try:
                        get = xsec.get(i)
                        if sys.argv[2] in get.text:
                                print '+ '+i+' -> Found'
                                f = open('re.txt', 'a+')
                                f.write(i+'\n')
                        else:
                                print '- '+i+' -> N.Found'
                except:
                        pass
except IndexError:
        print 'print Usage : python '+sys.argv[0]+' list.txt'