Process a file in a functional style with generators (no temporary lists!)

genlog.py

wwwlog = open("access-log")
total = 0
for line in wwwlog:
    bytestr = line.rsplit(None,1)[1]
    if bytestr != '-':
        total += int(bytestr)

print "Total", total


# more functional
wwwlog = open("access-log")
bytecolumn = (line.rsplit(None,1)[1] for line in wwwlog)
bytes = (int(x) for x in bytecolumn if x != '-')

print "Total", sum(bytes)